![](/img/trans.png)
[英]Why I'm getting exception System.Reflection.TargetInvocationException: 'Exception has been thrown by the target of an invocation.'?
[英]TargetInvocationException: Exception has been thrown by the target of an invocation. on Data Bind
我正在嘗試將GridView綁定到RowEditing事件上的數據源,但是會引發異常:
[TargetInvocationException:調用的目標引發了異常。]諸如Eval(),XPath()和Bind()之類的數據綁定方法只能在數據綁定控件的上下文中使用。
lblackout = EXMailbox.GetBlackouts();
BlackoutGridView.DataSource=lblackout;
protected void BlackoutGridView_RowEditing(object sender, GridViewEditEventArgs e)
{
BlackoutGridView.EditIndex = e.NewEditIndex;
BlackoutGridView.DataSource = lblackout; //Throws exception here.
BlackoutGridView.DataBind();
}
<asp:GridView ID="BlackoutGridView" runat="server" AutoGenerateColumns="False"
OnRowDeleting="BlackoutGridView_RowDeleting"
OnRowEditing="BlackoutGridView_RowEditing"
onrowcancelingedit="BlackoutGridView_RowCancelingEdit">
<Columns>
<asp:BoundField DataField="BlackoutId" HeaderText="BlackoutId" >
</asp:BoundField>
<asp:TemplateField HeaderText="Region">
<EditItemTemplate>
<asp:DropDownList ID="DropDownList11" runat="server" Text='<%# Bind("Region") %>'
DataSourceID="lblackout" DataTextField="Region" DataValueField="Region"></asp:DropDownList>
<asp:ObjectDataSource ID="lblackout" runat="server" SelectMethod="GetDataItem"
TypeName="Exchange.MailboxMove.WebUI.BlackoutScreen"></asp:ObjectDataSource>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Region") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Server" DataField="Server">
</asp:BoundField>
<asp:BoundField HeaderText="From Date" DataField="StartDateTime"
DataFormatString="{0:D}">
</asp:BoundField>
<asp:BoundField HeaderText="To Date" DataField="EndDateTime"
DataFormatString="{0:D}">
</asp:BoundField>
<asp:BoundField HeaderText="From Time" DataField="StartDateTime"
DataFormatString="{0:t}">
</asp:BoundField>
<asp:BoundField HeaderText="To Time" DataField="EndDateTime"
DataFormatString="{0:t}">
</asp:BoundField>
<asp:CheckBoxField HeaderText="IsWeekly" DataField="IsWeekly">
</asp:CheckBoxField>
<asp:CommandField DeleteText="Cancel" HeaderText="Action"
ShowDeleteButton="True" ShowEditButton="True" ShowHeader="True" >
</asp:CommandField>
根據您的代碼,我認為您錯過了Gridview的DataValue字段。
這是MSDN的示例,如何綁定下拉列表
<asp:DropDownList ID="InsertCategoryDropDownList"
DataSourceID="CategoriesDataSource"
DataTextField="CategoryName"
DataValueField="CategoryID"
RunAt="Server" />
沒有DataValue字段,行編輯和其他事件將不會執行邏輯。 我希望我能幫助你。 您也可以在MSDN中為SqlDatasource簽入http://msdn.microsoft.com/zh-cn/library/system.web.ui.webcontrols.sqldatasource.aspx
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.