blocks|key|1168865|text|下面是我要找的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1168866|DDL.SelectedIndex+=+DDL.Items.IndexOf(DDL.Items.FindByText("PassedValue"));|code-block|syntax|javascript|1168867|或|1168868|DDL.SelectedIndex+=+DDL.Items.IndexOf(DDL.Items.FindByValue("PassedValue"));|1168869|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Here is the code I was looking for :

<pre><code>DDL.SelectedIndex = DDL.Items.IndexOf(DDL.Items.FindByText("PassedValue"));
</code></pre>

Or

<pre><code>DDL.SelectedIndex = DDL.Items.IndexOf(DDL.Items.FindByValue("PassedValue"));
</code></pre>

blocks|key|954719|text|ddlData.SelectedIndex将包含用于在DropDown中选择特定值的int值：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|954720|ddlData.SelectedIndex=ddlData.Items.IndexOf(ddlData.Items.FindByText("value"));|code-block|syntax|javascript|954721|ddlData.Items.IndexOf(ddlData.Items.FindByText("value"));的return类型为int。|954722|entityMap^0|0|L|R|8|16|3|0|0|0|1L|1M|6|1V|3|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|N|$]]

<code>ddlData.SelectedIndex</code> will contain the <code>int</code> value To select the specific value into <code>DropDown</code> :

<pre><code>ddlData.SelectedIndex=ddlData.Items.IndexOf(ddlData.Items.FindByText("value"));
</code></pre>

<code>return</code> type of <code>ddlData.Items.IndexOf(ddlData.Items.FindByText("value"));</code> is <code>int</code>.

blocks|key|1168965|text|如果我没理解错你的问题的话。设置给定dropdownlist的值的解决方案是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1168966|dropdownlist1.Text="Your+Value";|code-block|syntax|javascript|1168967|只有当该值存在于dropdownlist的数据源中时，这才会起作用。|1168968|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|$]]

Well if I understood correctly your question. The Solution for setting the value for a given dropdownlist will be:

<pre><code>dropdownlist1.Text="Your Value";
</code></pre>

This will work only if the value is existing in the data-source of the dropdownlist.

blocks|key|1169028|text|如果需要根据表达式选择列表项，请执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1169029|foreach+(ListItem+listItem+in+list.Items)
{
++++listItem.Selected+=+listItem.Value.Contains("some+value");
}|code-block|syntax|javascript|1169030|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 need to select your list item based on an expression:

<pre><code>foreach (ListItem listItem in list.Items)
{
 listItem.Selected = listItem.Value.Contains("some value");
}
</code></pre>

blocks|key|954879|text|var+index+=+ctx.Items.FirstOrDefault(item+=>+Equals(item.Value,+Settings.Default.Format_Encoding));
ctx.SelectedIndex+=+ctx.Items.IndexOf(index);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|954880|或|unstyled|954881|foreach+(var+listItem+in+ctx.Items)
++listItem.Selected+=+Equals(listItem.Value+as+Encoding,+Settings.Default.Format_Encoding);|954882|应该行得通..特别是当使用扩展的RAD控件时，其中FindByText/Value甚至不存在！|954883|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>var index = ctx.Items.FirstOrDefault(item =&gt; Equals(item.Value, Settings.Default.Format_Encoding));
ctx.SelectedIndex = ctx.Items.IndexOf(index);
</code></pre>

OR

<pre><code>foreach (var listItem in ctx.Items)
 listItem.Selected = Equals(listItem.Value as Encoding, Settings.Default.Format_Encoding);
</code></pre>

Should work.. especially when using extended RAD controls in which FindByText/Value doesn't even exist!

blocks|key|1169160|text|++++++++++++ddlemployee.DataSource+=+ds.Tables[0];
++++++++++++ddlemployee.DataTextField+=+"Employee+Name";
++++++++++++ddlemployee.DataValueField+=+"RecId";
++++++++++++ddlemployee.DataBind();
++++++++++++ddlemployee.Items.Insert(0,+"All");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1169161|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> ddlemployee.DataSource = ds.Tables[0];
 ddlemployee.DataTextField = "Employee Name";
 ddlemployee.DataValueField = "RecId";
 ddlemployee.DataBind();
 ddlemployee.Items.Insert(0, "All");
</code></pre>

blocks|key|954936|text|ddList.Items.FindByText("oldValue").Selected+=+false;
ddList.Items.FindByText("newValue").Selected+=+true;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|954937|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>ddList.Items.FindByText("oldValue").Selected = false;
ddList.Items.FindByText("newValue").Selected = true;
</code></pre>

blocks|key|954981|text|在加载我的窗体时，comboBox将显示我的DataTable的ClassName列，因为它的DisplayMember也有它的ValueMember+(对用户不可见)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|954982|private+void+Form1_Load(object+sender,+EventArgs+e)
++++++++++++{
++++++++++++++++this.comboBoxSubjectCName.DataSource+=+this.Student.TableClass;
++++++++++++++++this.comboBoxSubjectCName.DisplayMember+=+TableColumn.ClassName;//Column+name+that+will+be+the+DisplayMember
++++++++++++++++this.comboBoxSubjectCName.ValueMember+=+TableColumn.ClassID;//Column+name+that+will+be+the+ValueMember
++++++++++++}|code-block|syntax|javascript|954983|entityMap^0|9|8|M|9|W|9|1B|D|1S|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|L|$]]

On load of My Windows Form the <code>comboBox</code> will display the <code>ClassName</code> column of my <code>DataTable</code> as it's the <code>DisplayMember</code> also has its <code>ValueMember</code> (not visible to user) with it.

<pre><code>private void Form1_Load(object sender, EventArgs e)
 {
 this.comboBoxSubjectCName.DataSource = this.Student.TableClass;
 this.comboBoxSubjectCName.DisplayMember = TableColumn.ClassName;//Column name that will be the DisplayMember
 this.comboBoxSubjectCName.ValueMember = TableColumn.ClassID;//Column name that will be the ValueMember
 }
</code></pre>

blocks|key|955000|text|安全检查，以仅选择是否匹配项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|955001|//try+to+find+item+in+list.++
ListItem+oItem+=+DDL.Items.FindByValue("PassedValue"));
//if+exists,+select+it.
if+(oItem+!=+null)+oItem.Selected+=+true;|code-block|syntax|javascript|955002|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|$]]

Safety check to only select if an item is matched.

<pre><code>//try to find item in list. 
ListItem oItem = DDL.Items.FindByValue("PassedValue"));
//if exists, select it.
if (oItem != null) oItem.Selected = true;
</code></pre>

blocks|key|955043|text|只需使用下面的oneliner：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|955044|divisions.Items.FindByText("Some+Text").Selected+=+true;
divisions.Items.FindByValue("some+value").Selected+=+true;|code-block|syntax|javascript|955045|其中divisions是一个下拉列表控件。|955046|希望这能帮助到别人。|955047|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Just Use this oneliner:

<pre><code>divisions.Items.FindByText("Some Text").Selected = true;
divisions.Items.FindByValue("some value").Selected = true;
</code></pre>

where divisions is a dropdownlist control.

Hope it helps someone.

I want to set the <code>selecteditem</code> attribute for an ASP.Net dropdownlist control programmatically.

So I want to pass a value to the dropdownlist control to set the selected item where the item is equal to the passed value.

Setting dropdownlist selecteditem programmatically

我想以编程方式设置ASP.Net dropdownlist控件的selecteditem属性。因此，我希望将一个值传递给dropdownlist控件，以设置所选的项，其中该项等于传递的值。

问以编程方式设置dropdownlist selecteditem
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