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[英]Error 'Object reference not set to an instance of an object' during grid.FindControl
[英]e.Item.FindControl throws Object reference not set to an instance of an object
这是引发异常的Repeater代码的一部分...“ Computer.Administrators”是StringCollection对象。 调试器显示“ AdminsEnumerator.Current”获得正确的字符串值,但是当“ txtAdministrators.Text”尝试设置值时-引发异常。 请提供意见。
<asp:Repeater ID="repeatAdministrators" OnItemDataBound="repeatAdministrators_ItemDataBound" runat="server">
<HeaderTemplate>
<tr>
<td class="formLabel">
Administrators:
</td>
<td class="formInputText">
</HeaderTemplate>
<ItemTemplate>
<asp:TextBox ID="txtAdministrators" runat="server" MaxLength="50" Enabled="False"></asp:TextBox><br />
</ItemTemplate>
<FooterTemplate>
</td> </tr>
<tr>
</FooterTemplate>
</asp:Repeater>
这是后面的代码。
protected void btnPing_Click(object sender, EventArgs e)
{
//...
repeatAdministrators.DataSource = Computer.Administrators;
repeatAdministrators.DataBind();
}
protected void repeatAdministrators_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
TextBox txtAdministrators = e.Item.FindControl("txtAdministrators") as TextBox;
StringEnumerator AdminsEnumerator = Computer.Administrators.GetEnumerator();
while (AdminsEnumerator.MoveNext())
{
txtAdministrators.Text = AdminsEnumerator.Current;
}
}
您需要确保您不在标题项目中:
if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
}
(对不起,这是从内存中获取的,但是应该放在您的ItemDataBound方法中)
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