blocks|key|234897|text|请注意，我更喜欢代码简短。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|234898|List<ListItem>+selected+=+CBLGold.Items.Cast<ListItem>()
++++.Where(li+=>+li.Selected)
++++.ToList();|code-block|syntax|javascript|234899|或者使用简单的foreach|offset|length|style|CODE|234900|List<ListItem>+selected+=+new+List<ListItem>();
foreach+(ListItem+item+in+CBLGold.Items)
++++if+(item.Selected)+selected.Add(item);|234901|如果您只是想要ListItem.Value|234902|List<string>+selectedValues+=+CBLGold.Items.Cast<ListItem>()
+++.Where(li+=>+li.Selected)
+++.Select(li+=>+li.Value)
+++.ToList();|234903|entityMap^0|0|0|7|7|0|0|7|E|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@$I|11|J|12|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

Note that I prefer the code to be short.
<pre><code>List&lt;ListItem&gt; selected = CBLGold.Items.Cast&lt;ListItem&gt;()
 .Where(li =&gt; li.Selected)
 .ToList();
</code></pre>
or with a simple <code>foreach</code>:
<pre><code>List&lt;ListItem&gt; selected = new List&lt;ListItem&gt;();
foreach (ListItem item in CBLGold.Items)
 if (item.Selected) selected.Add(item);
</code></pre>
If you just want the <code>ListItem.Value</code>:
<pre><code>List&lt;string&gt; selectedValues = CBLGold.Items.Cast&lt;ListItem&gt;()
 .Where(li =&gt; li.Selected)
 .Select(li =&gt; li.Value)
 .ToList();
</code></pre>

blocks|key|18477|text|下午好，您可以随时使用一个小LINQ来获取选定的列表项，然后对结果执行您想要的操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|18478|var+selected+=+CBLGold.Items.Cast<ListItem>().Where(x+=>+x.Selected);
//+work+with+selected...|code-block|syntax|javascript|18479|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|$]]

Good afternoon, you could always use a little LINQ to get the selected list items and then do what you want with the results:

<pre><code>var selected = CBLGold.Items.Cast&lt;ListItem&gt;().Where(x =&gt; x.Selected);
// work with selected...
</code></pre>

blocks|key|234971|text|foreach+(ListItem+item+in+CBLGold.Items)
{
++++if+(item.Selected)
++++{
++++++++string+selectedValue+=+item.Value;
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|234972|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>foreach (ListItem item in CBLGold.Items)
{
 if (item.Selected)
 {
 string selectedValue = item.Value;
 }
}
</code></pre>

blocks|key|234989|text|string+s=+string.Empty

for+(int+i+=+0;+i+<+Chkboxlist.Items.Count;+i%2B%2B)

{

++++if+(Chkboxlist.Items[i].Selected)
++++{
++++++++s%2B=+Chkboxlist.Items[i].Value+%2B+";";+
++++}

}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|234990|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>string s= string.Empty

for (int i = 0; i &lt; Chkboxlist.Items.Count; i++)

{

 if (Chkboxlist.Items[i].Selected)
 {
 s+= Chkboxlist.Items[i].Value + ";"; 
 }

}
</code></pre>

blocks|key|234998|text|List<string>+values+=new+list<string>();
foreach(ListItem+Item+in+ChkList.Item)
{
++++if(Item.Selected)
++++values.Add(item.Value);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|234999|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>List&lt;string&gt; values =new list&lt;string&gt;();
foreach(ListItem Item in ChkList.Item)
{
 if(Item.Selected)
 values.Add(item.Value);
}
</code></pre>

blocks|key|235062|text|在我的代码后台中，我在我的Page_Load事件中从sql+db创建了一个检查框列表，在我的button_click事件中从检查框列表中获取了所有的值，等等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|235063|因此，当我选中一些复选框，然后单击按钮时，发生的第一件事是我的page_load事件重新创建了检查框列表，因此在运行get复选框值时没有选中任何复选框。我没有在page_load事件中添加if+(!this.IsPostBack)|235064|protected+void+Page_Load(object+sender,+EventArgs+e)
{
+++if+(!this.IsPostBack)
+++{
++++++//+db+query+and+create+checkboxlist+and+other
++++++SqlConnection+dbConn+=+new+SqlConnection(WebConfigurationManager.ConnectionStrings["ConnString"].ConnectionString);
++++++string+query;
++++++try
++++++{
++++++++query+=+"SELECT+[name],+[mail]+FROM+[users]";
++++++++dbConn.Open();
++++++++SqlDataAdapter+da+=+new+SqlDataAdapter(query,+dbConn);
++++++++DataSet+ds+=+new+DataSet();
++++++++da.Fill(ds);
++++++++if+(ds.Tables[0].Rows.Count+!=+0)
++++++++{
++++++++++checkboxlist1.DataSource+=+ds;
++++++++++checkboxlist1.DataTextField+=+"name";
++++++++++checkboxlist1.DataValueField+=+"mail";
++++++++++checkboxlist1.DataBind();
++++++++}
++++++++else
++++++++{
++++++++++Response.Write("No+Results+found");
++++++++}
+++++++}
+++++++catch+(Exception+ex)
+++++++{
++++++++++Response.Write(" "+%2B+ex);
+++++++}
+++++++finally
+++++++{
++++++++++dbConn.Close();
+++++++}
+++}
}

protected+void+btnSend_Click(object+sender,+EventArgs+e)
+{
+++string+strChkBox+=+string.Empty;
+++foreach+(ListItem+li+in+checkboxlist1.Value)
++++{
++++++if+(li.Selected+==+true)
+++++++{
+++++++++strChkBox+%2B=+li.Value+%2B+";+";++++
+++++++++//+use+only+++strChkBox+%2B=+li+%2B+",+";+++if+you+want+the+name+of+each+checkbox+checked+rather+then+it's+value.
+++++++}
++++}
+++Response.Write(strChkBox);
+}|code-block|syntax|javascript|235065|正如预期的那样，输出是一个分号分隔的列表，供我在mailsend函数中使用：|235066|++++bill@contoso.com;+jeff@corp.inc;+sam@dot.net|235067|一个小问题的长篇答案。请注意，我远不是这方面的专家，我知道有比这更好的解决方案，但它可能会对一些人有所帮助。|235068|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

In my codebehind i created a checkboxlist from sql db in my Page_Load event and in my button_click event did all the get values from checkboxlist etc. 

So when i checked some checkboxes and then clicked my button the first thing that happend was that my page_load event recreated the checkboxlist thus not having any boxes checked when it ran my get checkbox values... 
I've missed to add in the page_load event the if (!this.IsPostBack)

<pre><code>protected void Page_Load(object sender, EventArgs e)
{
 if (!this.IsPostBack)
 {
 // db query and create checkboxlist and other
 SqlConnection dbConn = new SqlConnection(WebConfigurationManager.ConnectionStrings["ConnString"].ConnectionString);
 string query;
 try
 {
 query = "SELECT [name], [mail] FROM [users]";
 dbConn.Open();
 SqlDataAdapter da = new SqlDataAdapter(query, dbConn);
 DataSet ds = new DataSet();
 da.Fill(ds);
 if (ds.Tables[0].Rows.Count != 0)
 {
 checkboxlist1.DataSource = ds;
 checkboxlist1.DataTextField = "name";
 checkboxlist1.DataValueField = "mail";
 checkboxlist1.DataBind();
 }
 else
 {
 Response.Write("No Results found");
 }
 }
 catch (Exception ex)
 {
 Response.Write("&lt;br&gt;" + ex);
 }
 finally
 {
 dbConn.Close();
 }
 }
}

protected void btnSend_Click(object sender, EventArgs e)
 {
 string strChkBox = string.Empty;
 foreach (ListItem li in checkboxlist1.Value)
 {
 if (li.Selected == true)
 {
 strChkBox += li.Value + "; "; 
 // use only strChkBox += li + ", "; if you want the name of each checkbox checked rather then it's value.
 }
 }
 Response.Write(strChkBox);
 }
</code></pre>

And the output was as expected, a semicolon separeted list for me to use in a mailsend function:

<pre><code> bill@contoso.com; jeff@corp.inc; sam@dot.net
</code></pre>

A long answer to a small problem. Please note that i'm far from an expert at this and know that there are better solutions then this but it might help out for some.

blocks|key|18584|text|补充@Tim+Schmelter，取而代之的是取回List<int>，|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|18585|List<string>+selectedValues+=+CBLGold.Items.Cast<ListItem>()
+++.Where(li+=>+li.Selected)
+++.Select(li+=>+li.Value)
+++.Select(int.Parse)
+++.ToList();|code-block|syntax|javascript|18586|entityMap^0|P|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

To top up on @Tim Schmelter, in which to get back the <code>List&lt;int&gt;</code> instead,

<pre><code>List&lt;string&gt; selectedValues = CBLGold.Items.Cast&lt;ListItem&gt;()
 .Where(li =&gt; li.Selected)
 .Select(li =&gt; li.Value)
 .Select(int.Parse)
 .ToList();
</code></pre>

blocks|key|18628|text|如果您有一个数据绑定的checklistbox，则无法获取item(j).Selected，因为该控件没有选定的属性。如果你使用clearSelections，即on+Load，那么显然它现在能理解item(j).selected了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|18629|entityMap^0|B|C|T|G|2R|G|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

If you have a databound <code>checklistbox</code> it does not work to get <code>item(j).Selected</code>, because the control does not have a selected attribute. If you clearSelections i.e. on Load, then apparently it now understands <code>item(j).selected</code>.

blocks|key|18650|text|我喜欢使用这个简单的方法来获取所选值并将它们连接到一个字符串中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|18651|private+string+JoinCBLSelectedValues(CheckBoxList+cbl,+string+separator+=+"")
{
++++return+string.Join(separator,+cbl.Items.Cast<ListItem>().Where(li+=>+li.Selected).ToList());
}|code-block|syntax|javascript|18652|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|$]]

I like to use this simple method to get the selected values and join them into a string
<pre><code>private string JoinCBLSelectedValues(CheckBoxList cbl, string separator = &quot;&quot;)
{
 return string.Join(separator, cbl.Items.Cast&lt;ListItem&gt;().Where(li =&gt; li.Selected).ToList());
}
</code></pre>

blocks|key|18697|text|如果您希望将所选值存储在由,分隔的单个列中，则可以使用以下方法|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|18698|string+selectedItems+=+String.Join(",",+CBLGold.Items.OfType<ListItem>().Where(r+=>+r.Selected).Select(r+=>+r.Value));|code-block|syntax|javascript|18699|如果要存储文本而不是值，则将r.Value更改为r.Text|18700|entityMap^0|D|1|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Just in case you want to store the selected values in single column seperated by <code>,</code> then you can use below approach
<pre><code>string selectedItems = String.Join(&quot;,&quot;, CBLGold.Items.OfType&lt;ListItem&gt;().Where(r =&gt; r.Selected).Select(r =&gt; r.Value));
</code></pre>
if you want to store Text not values then
Change the r.Value to r.Text

I have a CheckBoxList like this:

<pre class="lang-xml prettyprint-override"><code>&lt;asp:CheckBoxList ID="CBLGold" runat="server" CssClass="cbl"&gt;
 &lt;asp:ListItem Value="TGJU"&gt; TG &lt;/asp:ListItem&gt;
 &lt;asp:ListItem Value="GOLDOZ"&gt; Gold &lt;/asp:ListItem&gt;
 &lt;asp:ListItem Value="SILVEROZ"&gt; Silver &lt;/asp:ListItem&gt;
 &lt;asp:ListItem Value="NERKH"&gt; NE &lt;/asp:ListItem&gt;
 &lt;asp:ListItem Value="TALA"&gt; Tala &lt;/asp:ListItem&gt;
 &lt;asp:ListItem Value="YARAN"&gt; Sekeh &lt;/asp:ListItem&gt;
&lt;/asp:CheckBoxList&gt;
</code></pre>

Now I want to get the value of the selected items from this CheckBoxList using foreach, and put the values into a list.

How to get values of selected items in CheckBoxList with foreach in ASP.NET C#?

我有一个这样的CheckBoxList：<asp:CheckBoxList ID="CBLGold" runat="server" CssClass="cbl"> <asp:ListItem Value="TGJU"> TG </asp:ListItem> <asp:ListItem Value="GOLD...

问如何在ASP.NET C#中使用foreach获取CheckBoxList中选定项的值？
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问如何在ASP.NET C#中使用foreach获取CheckBoxList中选定项的值？
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