blocks|key|3170040|text|如果您想在网格填充时隐藏列，可以在aspx页面本身中这样做|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3170041|<asp:BoundField+DataField="test"+HeaderText="test"+Visible="False"+/>|code-block|syntax|javascript|3170042|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you wanna hide that column while grid populating, you can do it in aspx page itself like this

<pre><code>&lt;asp:BoundField DataField="test" HeaderText="test" Visible="False" /&gt;
</code></pre>

blocks|key|1850801|text|当GridView的AutoGenerateColumns属性设置为true+(默认值为true)时，AutoGenerateColumns将始终为0。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1850802|您可以显式声明您的列并将AutoGenerateColumns属性设置为false，或者您可以在您的代码后台中使用此属性：|1850803|GridView.Rows[0].Cells.Count|1850804|要在绑定GridView数据后获取列数，或者执行以下操作：|1850805|protected+void+GridView_RowDataBound(object+sender,+GridViewRowEventArgs+e)
{
++++e.Row.Cells[index].Visible+=+false;
}|code-block|syntax|javascript|1850806|若要使用GridView的RowDataBound事件设置不可见的列，请执行以下操作。|1850807|entityMap^0|A|J|Y|4|18|4|1F|J|0|C|J|10|5|0|0|S|0|0|0|D|C|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1B|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|1C|8|@]|D|@]|E|$O|P]]|$1|Q|3|R|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|T|$]]

<code>GridView.Columns.Count</code> will always be 0 when your GridView has its <code>AutoGenerateColumns</code> property set to <code>true</code> (default is <code>true</code>).

You can explicitly declare your columns and set the <code>AutoGenerateColumns</code> property to <code>false</code>, or you can use this in your codebehind:

<code>GridView.Rows[0].Cells.Count</code> 

to get the column count once your GridView data has been bound, or this: 

<pre><code>protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
 e.Row.Cells[index].Visible = false;
}
</code></pre>

to set a column invisible using your GridView's <code>RowDataBound</code> event.

blocks|key|4580814|text|我看到的一些答案解释了如何使单元格的内容不可见，但没有解释如何隐藏整个列，这正是我想要做的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4580815|如果您有AutoGenerateColumns+=+"false"，并且正在对您想要隐藏的列实际使用BoundField，那么Bala的answer非常灵活。但是，如果对列使用TemplateField，则可以处理DataBound事件并执行以下操作：|offset|length|style|CODE|4580816|protected+void+gridView_DataBound(object+sender,+EventArgs+e)
{
++++const+int+countriesColumnIndex+=+4;

++++if+(someCondition+==+true)
++++{
++++++++//+Hide+the+Countries+column
++++++++this.gridView.Columns[countriesColumnIndex].Visible+=+false;
++++}
}|code-block|syntax|javascript|4580817|这可能不是OP正在寻找的解决方案，但当我发现自己在问同样的问题时，这是我正在寻找的解决方案。|4580818|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/3819578/154637^0|0|4|T|1E|A|2G|D|2Z|9|1W|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]|$D|10|E|11|F|G]|$D|12|E|13|F|G]|$D|14|E|15|F|G]]|9|@$D|16|E|17|1|18]]|A|$]]|$1|H|3|I|5|J|7|19|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1A|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Some of the answers I've seen explain how to make the contents of a cell invisible, but not how to hide the entire column, which is what I wanted to do.

If you have <code>AutoGenerateColumns = "false"</code> and are actually using <code>BoundField</code> for the column you want to hide, Bala's <a href="https://stackoverflow.com/a/3819578/154637">answer</a> is slick. But if you are using <code>TemplateField</code> for the column, you can handle the <code>DataBound</code> event and do something like this:

<pre><code>protected void gridView_DataBound(object sender, EventArgs e)
{
 const int countriesColumnIndex = 4;

 if (someCondition == true)
 {
 // Hide the Countries column
 this.gridView.Columns[countriesColumnIndex].Visible = false;
 }
}
</code></pre>

This may not be what the OP was looking for, but it's the solution I was looking for when I found myself asking the same question.

blocks|key|3170156|text|通过在datacontrolfield集合中查询所需的列标题文本并将其可见性设置为true，可以隐藏特定的列。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3170157|((DataControlField)gridView.Columns
+++++++++++++++.Cast<DataControlField>()
+++++++++++++++.Where(fld+=>+(fld.HeaderText+==+"Title"))
+++++++++++++++.SingleOrDefault()).Visible+=+false;|code-block|syntax|javascript|3170158|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can hide a specific column by querying the datacontrolfield collection for the desired column header text and setting its visibility to true.

<pre><code>((DataControlField)gridView.Columns
 .Cast&lt;DataControlField&gt;()
 .Where(fld =&gt; (fld.HeaderText == "Title"))
 .SingleOrDefault()).Visible = false;
</code></pre>

blocks|key|4580910|text|这对我很有帮助|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4580911|this.myGridview.Columns[0].Visible+=+false;|code-block|syntax|javascript|4580912|这里0是我想要隐藏的列索引。|4580913|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This helped for me

<pre><code>this.myGridview.Columns[0].Visible = false;
</code></pre>

Here 0 is the column index i want to hide.

blocks|key|1105017|text|请使用此代码。如果该列为空，则使其不可见...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1105018|++++protected+void+gridview1_DataBound(object+sender,+EventArgs+e)
++++{
++++++++Boolean+hasData+=+false;
++++++++for+(int+col+=+0;+col+<+gridview1.HeaderRow.Cells.Count;+col%2B%2B)
++++++++{
++++++++++++for+(int+row+=+0;+row+<+gridview1.Rows.Count;+row%2B%2B)
++++++++++++{
++++++++++++++++if+(!String.IsNullOrEmpty(gridview1.Rows[row].Cells[col].Text)
++++++++++++++++++++&&+!String.IsNullOrEmpty(HttpUtility.HtmlDecode(gridview1.Rows[row].Cells[col].Text).Trim()))
++++++++++++++++{
++++++++++++++++++++hasData+=+true;
++++++++++++++++++++break;
++++++++++++++++}
++++++++++++}

++++++++++++if+(!hasData)
++++++++++++{
++++++++++++++++gridview1.HeaderRow.Cells[col].Visible+=+false;
++++++++++++++++for+(int+hiddenrows+=+0;+hiddenrows+<+gridview1.Rows.Count;+hiddenrows%2B%2B)
++++++++++++++++{
++++++++++++++++++++gridview1.Rows[hiddenrows].Cells[col].Visible+=+false;
++++++++++++++++}
++++++++++++}

++++++++++++hasData+=+false;

++++++++}

++++}|code-block|syntax|javascript|1105019|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Please use this code. This make invisible column if empty...

<pre><code> protected void gridview1_DataBound(object sender, EventArgs e)
 {
 Boolean hasData = false;
 for (int col = 0; col &lt; gridview1.HeaderRow.Cells.Count; col++)
 {
 for (int row = 0; row &lt; gridview1.Rows.Count; row++)
 {
 if (!String.IsNullOrEmpty(gridview1.Rows[row].Cells[col].Text)
 &amp;&amp; !String.IsNullOrEmpty(HttpUtility.HtmlDecode(gridview1.Rows[row].Cells[col].Text).Trim()))
 {
 hasData = true;
 break;
 }
 }

 if (!hasData)
 {
 gridview1.HeaderRow.Cells[col].Visible = false;
 for (int hiddenrows = 0; hiddenrows &lt; gridview1.Rows.Count; hiddenrows++)
 {
 gridview1.Rows[hiddenrows].Cells[col].Visible = false;
 }
 }

 hasData = false;

 }

 }
</code></pre>

blocks|key|1102410|text|+private+void+Registration_Load(object+sender,+EventArgs+e)
++++{

++++++++++++++++++++++++//hiding+data+grid+view+coloumn
++++++++++++++++++++++++datagridview1.AutoGenerateColumns+=+true;
++++++++++++++++++++++++++++datagridview1.DataSource+=dataSet;
++++++++++++++++++++++++++++datagridview1.DataMember+=+"users";+//++users+is+table+name
++++++++++++++++++++++++++++datagridview1.Columns[0].Visible+=+false;//hiding+1st+coloumn+coloumn
++++++++++++++++++++++++++++datagridview1.Columns[2].Visible+=+false;+hiding+2nd+coloumn
++++++++++++++++++++++++++++datagridview1.Columns[3].Visible+=+false;+hiding+3rd+coloumn
++++++++++++++++++++++++//end+of+hiding+datagrid+view+coloumns

++++++++}


++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1102411|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> private void Registration_Load(object sender, EventArgs e)
 {

 //hiding data grid view coloumn
 datagridview1.AutoGenerateColumns = true;
 datagridview1.DataSource =dataSet;
 datagridview1.DataMember = "users"; // users is table name
 datagridview1.Columns[0].Visible = false;//hiding 1st coloumn coloumn
 datagridview1.Columns[2].Visible = false; hiding 2nd coloumn
 datagridview1.Columns[3].Visible = false; hiding 3rd coloumn
 //end of hiding datagrid view coloumns

 }


 }
</code></pre>

blocks|key|3170266|text|有一个小的变化，它不会在rowdatabound绑定下，首先所有的行都应该被绑定，只有这样我们才能隐藏它。因此，在网格被dataBound之后，它将是一个单独的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3170267|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

There is a small change to happen, it will not come under rowdatabound, first all the rows should get bound, only then could we hide that. So it will be a separate method after the grid is dataBound.

blocks|key|1105066|text|当列Id未知且AutoGenerateColumns+==为真时，这是对我有效的代码；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1105067|<%25@+Page+Language="C#"+%25>
<%25@+Import+Namespace="System.Data"+%25>
<%25@+Import+Namespace="System.Drawing"+%25>
<html>
<head+runat="server">
++++<script+runat="server">
++++++++protected+void+Page_Load(object+sender,+EventArgs+eventArgs)
++++++++{
++++++++++++DataTable+data+=+new+DataTable();
++++++++++++data.Columns.Add("Id",+typeof(int));
++++++++++++data.Columns.Add("Notes",+typeof(string));
++++++++++++data.Columns.Add("RequestedDate",+typeof(DateTime));
++++++++++++for+(int+idx+=+0;+idx+<+5;+idx%2B%2B)
++++++++++++{
++++++++++++++++DataRow+row+=+data.NewRow();
++++++++++++++++row["Id"]+=+idx;
++++++++++++++++row["Notes"]+=+string.Format("Note+{0}",+idx);
++++++++++++++++row["RequestedDate"]+=+DateTime.Now.Subtract(new+TimeSpan(idx,+0,+0,+0,+0));
++++++++++++++++data.Rows.Add(row);
++++++++++++}
++++++++++++listData.DataSource+=+data;
++++++++++++listData.DataBind();
++++++++}

++++++++private+void+GridView_RowDataBound(object+sender,+GridViewRowEventArgs+e)
++++++++{
++++++++++++foreach+(TableCell+tableCell+in+e.Row.Cells)
++++++++++++{
++++++++++++++++DataControlFieldCell+cell+=+(DataControlFieldCell)tableCell;
++++++++++++++++if+(cell.ContainingField.HeaderText+==+"Id")
++++++++++++++++{
++++++++++++++++++++cell.Visible+=+false;
++++++++++++++++++++continue;
++++++++++++++++}
++++++++++++++++if+(cell.ContainingField.HeaderText+==+"Notes")
++++++++++++++++{
++++++++++++++++++++cell.Width+=+400;
++++++++++++++++++++cell.BackColor+=+Color.Blue;
++++++++++++++++++++continue;
++++++++++++++++}
++++++++++++++++if+(cell.ContainingField.HeaderText+==+"RequestedDate")
++++++++++++++++{
++++++++++++++++++++cell.Width+=+130;
++++++++++++++++++++continue;
++++++++++++++++}
++++++++++++}
++++++++}

++++</script>
</head>
<body>
++++<form+runat="server">
++++++++<asp:GridView+runat="server"+ID="listData"+AutoGenerateColumns="True"+HorizontalAlign="Left"
++++++++++++PageSize="20"+OnRowDataBound="GridView_RowDataBound"+EmptyDataText="No+Data+Available."
++++++++++++Width="95%25">
++++++++</asp:GridView>
++++</form>
</body>
</html>|code-block|syntax|javascript|1105068|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This was the code that worked for me when the column Id is unknown and the AutoGenerateColumns == true; 

<pre><code>&lt;%@ Page Language="C#" %&gt;
&lt;%@ Import Namespace="System.Data" %&gt;
&lt;%@ Import Namespace="System.Drawing" %&gt;
&lt;html&gt;
&lt;head runat="server"&gt;
 &lt;script runat="server"&gt;
 protected void Page_Load(object sender, EventArgs eventArgs)
 {
 DataTable data = new DataTable();
 data.Columns.Add("Id", typeof(int));
 data.Columns.Add("Notes", typeof(string));
 data.Columns.Add("RequestedDate", typeof(DateTime));
 for (int idx = 0; idx &lt; 5; idx++)
 {
 DataRow row = data.NewRow();
 row["Id"] = idx;
 row["Notes"] = string.Format("Note {0}", idx);
 row["RequestedDate"] = DateTime.Now.Subtract(new TimeSpan(idx, 0, 0, 0, 0));
 data.Rows.Add(row);
 }
 listData.DataSource = data;
 listData.DataBind();
 }

 private void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
 {
 foreach (TableCell tableCell in e.Row.Cells)
 {
 DataControlFieldCell cell = (DataControlFieldCell)tableCell;
 if (cell.ContainingField.HeaderText == "Id")
 {
 cell.Visible = false;
 continue;
 }
 if (cell.ContainingField.HeaderText == "Notes")
 {
 cell.Width = 400;
 cell.BackColor = Color.Blue;
 continue;
 }
 if (cell.ContainingField.HeaderText == "RequestedDate")
 {
 cell.Width = 130;
 continue;
 }
 }
 }

 &lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
 &lt;form runat="server"&gt;
 &lt;asp:GridView runat="server" ID="listData" AutoGenerateColumns="True" HorizontalAlign="Left"
 PageSize="20" OnRowDataBound="GridView_RowDataBound" EmptyDataText="No Data Available."
 Width="95%"&gt;
 &lt;/asp:GridView&gt;
 &lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

blocks|key|4581088|text|如果要按列的名称隐藏列，而不是按其在GridView中的索引。创建DataTable或Dataset后，您必须通过其名称找到列的索引，然后将索引保存在全局变量中，如ViewStae、Session等，然后在RowDataBound中调用它，如下例所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4581089|string+headerName+=+"Id";
++++++++DataTable+dt+=+....+;

++++++++for+(int+i=0;i<dt.Columns.Count;i%2B%2B)
++++++++{
++++++++++++if+(dt.Columns[i].ColumnName+==+headerName)
++++++++++++{
++++++++++++++++ViewState["CellIndex"]+=+i;

++++++++++++}

++++++++}

++...+GridView_RowDataBound(object+sender,+GridViewRowEventArgs+e)
{

++++if+(e.Row.RowType+==+DataControlRowType.Header+%7C%7C+e.Row.RowType+==+DataControlRowType.DataRow+%7C%7C+e.Row.RowType+==+DataControlRowType.Footer)
++++{

++++++++int+index+=+Convert.ToInt32(ViewState["CellIndex"]);

++++++++e.Row.Cells[index].Visible+=+false;
++++}++++++++++++++++++++++++
}|code-block|syntax|javascript|4581090|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want to hide a column by its name instead of its index in GridView. After creating DataTable or Dataset, you have to find the index of the column by its name then save index in global variable like ViewStae, Session and etc and then call it in RowDataBound, like the example:

<pre><code>string headerName = "Id";
 DataTable dt = .... ;

 for (int i=0;i&lt;dt.Columns.Count;i++)
 {
 if (dt.Columns[i].ColumnName == headerName)
 {
 ViewState["CellIndex"] = i;

 }

 }

 ... GridView_RowDataBound(object sender, GridViewRowEventArgs e)
{

 if (e.Row.RowType == DataControlRowType.Header || e.Row.RowType == DataControlRowType.DataRow || e.Row.RowType == DataControlRowType.Footer)
 {

 int index = Convert.ToInt32(ViewState["CellIndex"]);

 e.Row.Cells[index].Visible = false;
 } 
}
</code></pre>

blocks|key|1847852|text|这里的大多数答案没有解释的是-如果您需要使列再次可见和不可见，所有这些列都是基于动态数据的，该怎么办？毕竟，GridViews不应该是以数据为中心的吗？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1847853|如果您想根据数据打开或关闭列，该怎么办？|1847854|我的Gridview|1847855|<asp:GridView+ID="gvLocationBoard"+runat="server"+AllowPaging="True"+AllowSorting="True"+ShowFooter="false"+ShowHeader="true"+Visible="true"+AutoGenerateColumns="false"+CellPadding="4"+ForeColor="#333333"+GridLines="None"
++++++++++++DataSourceID="sdsLocationBoard"+OnDataBound="gvLocationBoard_DataBound"+OnRowDataBound="gvLocationBoard_RowDataBound"+PageSize="15"+OnPreRender="gvLocationBoard_PreRender">
++++++++++++<RowStyle+BackColor="#F7F6F3"+ForeColor="#333333"+/>
++++++++++++<Columns>
++++++++++++++++<asp:TemplateField+HeaderText="StudentID"+SortExpression="StudentID"+Visible="False">
++++++++++++++++++++<ItemTemplate>
++++++++++++++++++++++++<asp:Label+ID="Label2"+runat="server"+Text='<%25#+Eval("StudentID")+%25>'></asp:Label>
++++++++++++++++++++</ItemTemplate>
++++++++++++++++</asp:TemplateField>
++++++++++++++++<asp:TemplateField+HeaderText="Student"+SortExpression="StudentName">
++++++++++++++++++++<ItemTemplate>
++++++++++++++++++++++++<asp:Label+ID="Label3"+runat="server"+Text='<%25#+Eval("StudentName")+%25>'></asp:Label>
++++++++++++++++++++</ItemTemplate>
++++++++++++++++</asp:TemplateField>
++++++++++++++++<asp:TemplateField+HeaderText="Status"+SortExpression="CheckStatusName"+ItemStyle-HorizontalAlign="Center">
++++++++++++++++++++<ItemTemplate>
++++++++++++++++++++++++<asp:HiddenField+ID="hfStatusID"+runat="server"+Value='<%25#+Eval("CheckStatusID")+%25>'+/>
++++++++++++++++++++++++<asp:Label+ID="Label4"+runat="server"+Text='<%25#+Eval("CheckStatusName")+%25>'></asp:Label>
++++++++++++++++++++</ItemTemplate>
++++++++++++++++</asp:TemplateField>
++++++++++++++++<asp:TemplateField+HeaderText="RollCallPeriod0"+Visible="False">
++++++++++++++++++++<ItemTemplate>
++++++++++++++++++++++++<asp:CheckBox+ID="cbRollCallPeriod0"+runat="server"+/>
++++++++++++++++++++++++<asp:HiddenField+ID="hfRollCallPeriod0"+runat="server"+Value='<%25#+Eval("RollCallPeriod")+%25>'+/>
++++++++++++++++++++</ItemTemplate>
++++++++++++++++++++<HeaderStyle+Font-Size="Small"+/>
++++++++++++++++++++<ItemStyle+HorizontalAlign="Center"+/>
++++++++++++++++</asp:TemplateField>
++++++++++++++++<asp:TemplateField+HeaderText="RollCallPeriod1"+Visible="False">
++++++++++++++++++++<ItemTemplate>
++++++++++++++++++++++++<asp:CheckBox+ID="cbRollCallPeriod1"+runat="server"+/>
++++++++++++++++++++++++<asp:HiddenField+ID="hfRollCallPeriod1"+runat="server"+Value='<%25#+Eval("RollCallPeriod")+%25>'+/>
++++++++++++++++++++</ItemTemplate>
++++++++++++++++++++<HeaderStyle+Font-Size="Small"+/>
++++++++++++++++++++<ItemStyle+HorizontalAlign="Center"+/>
++++++++++++++++</asp:TemplateField>
++++++++..
etc..|code-block|syntax|javascript|1847856|注意`"RollCallPeriodn"，其中'n‘是一个序列号。|1847857|我这样做的方法是，根据我的数据，根据我的数据，通过设计隐藏所有列，我知道这些列稍后将打开(visible="true")或关闭(visible="false")。|BOLD|1847858|在我的例子中，我想要显示Period+Times直到某一列。例如，如果今天是上午9点，那么我希望显示周期为6am、7am、8am和9am，而不是+10am、11am等。|1847859|在其他的日子里，我想展示所有的时间。诸若此类。|1847860|那么我们该怎么做呢？|1847861|为什么不使用PreRender来“重置”Gridview|1847862|protected+void+gvLocationBoard_PreRender(object+sender,+EventArgs+e)
{
++++GridView+gv+=+(GridView)sender;
++++int+wsPos+=+3;
++++for+(int+wsCol+=+0;+wsCol+<+19;+wsCol%2B%2B)
++++{
++++++++gv.Columns[wsCol+%2B+wsPos].HeaderText+=+"RollCallPeriod"+%2B+wsCol.ToString("{0,00}");
++++++++gv.Columns[wsCol+%2B+wsPos].Visible+=+false;
++++}
}|1847863|现在，根据查找HeaderText的开头打开所需的列，如果标题文本不是默认文本，则使该列可见。|1847864|++protected+void+gvLocationBoard_DataBound(object+sender,+EventArgs+e)
++++{
++++++++//Show+the+headers+for+the+Period+Times+directly+from+sdsRollCallPeriods
++++++++DataSourceSelectArguments+dss+=+new+DataSourceSelectArguments();
++++++++DataView+dv+=+sdsRollCallPeriods.Select(dss)+as+DataView;
++++++++DataTable+dt+=+dv.ToTable()+as+DataTable;
++++++++if+(dt+!=+null)
++++++++{
++++++++++++int+wsPos+=+0;
++++++++++++int+wsCol+=+3;++//start+of+PeriodTimes+column+in+gvLocationBoard
++++++++++++foreach+(DataRow+dr+in+dt.Rows)
++++++++++++{
++++++++++++++++gvLocationBoard.Columns[wsCol+%2B+wsPos].HeaderText+=+dr.ItemArray[1].ToString();
++++++++++++++++gvLocationBoard.Columns[wsCol+%2B+wsPos].Visible+=+!gvLocationBoard.Columns[wsCol+%2B+wsPos].HeaderText.StartsWith("RollCallPeriod");

++++++++++++++++wsPos+%2B=+1;
++++++++++++}
++++++++}
++++}|1847865|我不会在这里展示SqlDataSource，但我可以说，使用PreRender，我可以重置我的GridView，并打开我想要的列和我想要的标题。|1847866|因此，它的工作方式是，每次您选择一个不同的日期或时间段作为标题显示时，在再次构建gridview之前，它会将GridView重置为默认的标题文本和Visible="false“状态。否则，如果没有PreRender，GridView将具有以前数据的标头，因为后台代码将擦除的默认设置。|1847867|entityMap^0|1I|9|0|0|2|8|0|0|0|R|5|0|0|0|0|6|9|K|8|0|0|1A|1|0|0|8|D|U|9|1B|8|0|14|8|2Q|9|3S|3|0^^$0|@$1|2|3|4|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1G|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1H|8|@$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1K|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1L|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1M|8|@$9|1N|A|1O|B|S]]|D|@]|E|$]]|$1|T|3|U|5|6|7|1P|8|@]|D|@]|E|$]]|$1|V|3|W|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|X|3|Y|5|6|7|1R|8|@]|D|@]|E|$]]|$1|Z|3|10|5|6|7|1S|8|@$9|1T|A|1U|B|C]|$9|1V|A|1W|B|C]]|D|@]|E|$]]|$1|11|3|12|5|L|7|1X|8|@]|D|@]|E|$M|N]]|$1|13|3|14|5|6|7|1Y|8|@$9|1Z|A|20|B|S]]|D|@]|E|$]]|$1|15|3|16|5|L|7|21|8|@]|D|@]|E|$M|N]]|$1|17|3|18|5|6|7|22|8|@$9|23|A|24|B|C]|$9|25|A|26|B|C]|$9|27|A|28|B|C]]|D|@]|E|$]]|$1|19|3|1A|5|6|7|29|8|@$9|2A|A|2B|B|C]|$9|2C|A|2D|B|C]|$9|2E|A|2F|B|S]]|D|@]|E|$]]|$1|1B|3|-4|5|6|7|2G|8|@]|D|@]|E|$]]]|1C|$]]

What most answers here don't explain is - what if you need to make columns visible again and invisible, all based on data dynamically? After all, shouldn't <code>GridViews</code> be data centric?

What if you want to turn ON or OFF columns based on your data?

My <code>Gridview</code>

<pre><code>&lt;asp:GridView ID="gvLocationBoard" runat="server" AllowPaging="True" AllowSorting="True" ShowFooter="false" ShowHeader="true" Visible="true" AutoGenerateColumns="false" CellPadding="4" ForeColor="#333333" GridLines="None"
 DataSourceID="sdsLocationBoard" OnDataBound="gvLocationBoard_DataBound" OnRowDataBound="gvLocationBoard_RowDataBound" PageSize="15" OnPreRender="gvLocationBoard_PreRender"&gt;
 &lt;RowStyle BackColor="#F7F6F3" ForeColor="#333333" /&gt;
 &lt;Columns&gt;
 &lt;asp:TemplateField HeaderText="StudentID" SortExpression="StudentID" Visible="False"&gt;
 &lt;ItemTemplate&gt;
 &lt;asp:Label ID="Label2" runat="server" Text='&lt;%# Eval("StudentID") %&gt;'&gt;&lt;/asp:Label&gt;
 &lt;/ItemTemplate&gt;
 &lt;/asp:TemplateField&gt;
 &lt;asp:TemplateField HeaderText="Student" SortExpression="StudentName"&gt;
 &lt;ItemTemplate&gt;
 &lt;asp:Label ID="Label3" runat="server" Text='&lt;%# Eval("StudentName") %&gt;'&gt;&lt;/asp:Label&gt;
 &lt;/ItemTemplate&gt;
 &lt;/asp:TemplateField&gt;
 &lt;asp:TemplateField HeaderText="Status" SortExpression="CheckStatusName" ItemStyle-HorizontalAlign="Center"&gt;
 &lt;ItemTemplate&gt;
 &lt;asp:HiddenField ID="hfStatusID" runat="server" Value='&lt;%# Eval("CheckStatusID") %&gt;' /&gt;
 &lt;asp:Label ID="Label4" runat="server" Text='&lt;%# Eval("CheckStatusName") %&gt;'&gt;&lt;/asp:Label&gt;
 &lt;/ItemTemplate&gt;
 &lt;/asp:TemplateField&gt;
 &lt;asp:TemplateField HeaderText="RollCallPeriod0" Visible="False"&gt;
 &lt;ItemTemplate&gt;
 &lt;asp:CheckBox ID="cbRollCallPeriod0" runat="server" /&gt;
 &lt;asp:HiddenField ID="hfRollCallPeriod0" runat="server" Value='&lt;%# Eval("RollCallPeriod") %&gt;' /&gt;
 &lt;/ItemTemplate&gt;
 &lt;HeaderStyle Font-Size="Small" /&gt;
 &lt;ItemStyle HorizontalAlign="Center" /&gt;
 &lt;/asp:TemplateField&gt;
 &lt;asp:TemplateField HeaderText="RollCallPeriod1" Visible="False"&gt;
 &lt;ItemTemplate&gt;
 &lt;asp:CheckBox ID="cbRollCallPeriod1" runat="server" /&gt;
 &lt;asp:HiddenField ID="hfRollCallPeriod1" runat="server" Value='&lt;%# Eval("RollCallPeriod") %&gt;' /&gt;
 &lt;/ItemTemplate&gt;
 &lt;HeaderStyle Font-Size="Small" /&gt;
 &lt;ItemStyle HorizontalAlign="Center" /&gt;
 &lt;/asp:TemplateField&gt;
 ..
etc..
</code></pre>

Note the `"RollCallPeriodn", where 'n' is a sequential number.

The way I do it, is to by design hide all columns that I know are going to be ON (visible="true") or OFF (visible="false") later, and depending on my data.

In my case I want to display Period Times up to a certain column. So for example, if today is 9am then I want to show periods 6am, 7am, 8am and 9am, but not 10am, 11am, etc.

On other days I want to show ALL the times. And so on.

So how do we do this?

Why not use <code>PreRender</code> to "reset" the <code>Gridview</code>?

<pre><code>protected void gvLocationBoard_PreRender(object sender, EventArgs e)
{
 GridView gv = (GridView)sender;
 int wsPos = 3;
 for (int wsCol = 0; wsCol &lt; 19; wsCol++)
 {
 gv.Columns[wsCol + wsPos].HeaderText = "RollCallPeriod" + wsCol.ToString("{0,00}");
 gv.Columns[wsCol + wsPos].Visible = false;
 }
}
</code></pre>

Now turn ON the columns you need based on finding the Start of the HeaderText and make the column visible if the header text is not the default.

<pre><code> protected void gvLocationBoard_DataBound(object sender, EventArgs e)
 {
 //Show the headers for the Period Times directly from sdsRollCallPeriods
 DataSourceSelectArguments dss = new DataSourceSelectArguments();
 DataView dv = sdsRollCallPeriods.Select(dss) as DataView;
 DataTable dt = dv.ToTable() as DataTable;
 if (dt != null)
 {
 int wsPos = 0;
 int wsCol = 3; //start of PeriodTimes column in gvLocationBoard
 foreach (DataRow dr in dt.Rows)
 {
 gvLocationBoard.Columns[wsCol + wsPos].HeaderText = dr.ItemArray[1].ToString();
 gvLocationBoard.Columns[wsCol + wsPos].Visible = !gvLocationBoard.Columns[wsCol + wsPos].HeaderText.StartsWith("RollCallPeriod");

 wsPos += 1;
 }
 }
 }
</code></pre>

I won't reveal the <code>SqlDataSource</code> here, but suffice to say with the <code>PreRender</code>, I can reset my <code>GridView</code> and turn ON the columns I want with the headers I want.

So the way it works is that everytime you select a different date or time periods to display as headers, it resets the GridView to the default header text and Visible="false" status before it builds the <code>gridview</code> again. Otherwise, without the <code>PreRender</code>, the GridView will have the previous data's headers as the code behind wipes the default settings.

blocks|key|3170512|text|由于您希望隐藏列，因此可以始终在网格视图的preRender事件中隐藏该列。这有助于减少每行每个行数据绑定事件的一次操作。对于prerender事件，您只需要执行一次操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3170513|protected+void+gvVoucherList_PreRender(object+sender,+EventArgs+e)
++++{
++++++++try
++++++++{
++++++++++++int+RoleID+=+Convert.ToInt32(Session["RoleID"]);

++++++++++++switch+(RoleID)
++++++++++++{
++++++++++++++++case+6:+gvVoucherList.Columns[11].Visible+=+false;
++++++++++++++++++++break;
++++++++++++++++case+1:+gvVoucherList.Columns[10].Visible+=+false;
++++++++++++++++++++break;
++++++++++++}
++++++++++++if(hideActionColumn+==+"ActionSM")
++++++++++++{
++++++++++++++++gvVoucherList.Columns[10].Visible+=+false;
++++++++++++++++hideActionColumn+=+string.Empty;
++++++++++++}
++++++++}
++++++++catch+(Exception+Ex)
++++++++{

++++++++}
++++}|code-block|syntax|javascript|3170514|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Since you want to hide your column you can always hide the column in preRender event of the gridview . This helps you with reducing one operation for every rowdatabound event per row . You will need only one operation for prerender event .

<pre><code>protected void gvVoucherList_PreRender(object sender, EventArgs e)
 {
 try
 {
 int RoleID = Convert.ToInt32(Session["RoleID"]);

 switch (RoleID)
 {
 case 6: gvVoucherList.Columns[11].Visible = false;
 break;
 case 1: gvVoucherList.Columns[10].Visible = false;
 break;
 }
 if(hideActionColumn == "ActionSM")
 {
 gvVoucherList.Columns[10].Visible = false;
 hideActionColumn = string.Empty;
 }
 }
 catch (Exception Ex)
 {

 }
 }
</code></pre>

I want to hide ID column in my GridView, I knew the code 

<pre><code>GridView1.Columns[0].Visible = false;
</code></pre>

but the surprise was that my count property for my <code>GridView</code> columns is 0 !!! while I can see data in the <code>GridView</code>, so any ideas?

Thank you,

Update:

here is the complete code for the method which populate the <code>GridView</code>

<pre><code>public DataSet GetAllPatients()
{
 SqlConnection connection = new SqlConnection(this.ConnectionString);

 String sql = "SELECT [ID],[Name],[Age],[Phone],[MedicalHistory],[Medication],[Diagnoses] FROM [dbo].[AwadyClinc_PatientTbl]order by ID desc";

 SqlCommand command = new SqlCommand(sql, connection);

 SqlDataAdapter da = new SqlDataAdapter(command);

 DataSet ds = new DataSet();

 da.Fill(ds);

 return ds;

}
</code></pre>

GridView Hide Column by code

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想在我的GridView中隐藏ID列，我知道代码GridView1.Columns[0].Visible = false;但令人惊讶的是，我的GridView列的count属性是0！虽然我可以在GridView中看到数据，但是你有什么想法吗？谢谢,更新：下面是填充GridView的方法的完整代码public Data...

问GridView按代码隐藏列
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