我正在尝试将 ImageUrl 指向 GridView 中模板字段中的图像，但不断收到错误：
你调用的对象是空的。在这一行：
Dim imagePath As String = rowView("image_path")
我以前从未在 GridView 上这样做过，但它在 ListView 上工作过。
感谢您的帮助，这是我的代码：
.APSX
<asp:GridView ID="gvImages" DataKeyNames="id" runat="server" AutoGenerateColumns="False" BorderWidth="0px" GridLines="None">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="imageId" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:Image ID="imageFile" runat="server"></asp:Image>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="id" />
</Columns>
</asp:GridView>
背后的代码
Protected Sub gvImages_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvImages.RowDataBound
Dim rowView As DataRowView = CType(e.Row.DataItem, DataRowView)
Dim imagePath As String = rowView("image_path")
Dim strImageUrl As String = "~/admin/images/cases/" & Request.QueryString("uid") & "/" & imagePath
Dim imageFile As System.Web.UI.WebControls.Image = CType(e.Row.FindControl("imageFile"), System.Web.UI.WebControls.Image)
imageFile.ImageUrl = strImageUrl
End Sub
我认为您需要检查它是数据行而不是标题行
Try this
Protected Sub gvImages_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvImages.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
Dim rowView As DataRowView = CType(e.Row.DataItem, DataRowView)
Dim imagePath As String = rowView("image_path")
Dim strImageUrl As String = "~/admin/images/cases/" & Request.QueryString("uid") & "/" & imagePath
Dim imageFile As System.Web.UI.WebControls.Image = CType(e.Row.FindControl("imageFile"), System.Web.UI.WebControls.Image)
imageFile.ImageUrl = strImageUrl
End If
End Sub
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