vb.net 将值绑定到 gridview 内的文本框

Binding value to textbox inside of gridview

提问by OhSnap

I have problems with binding a value of a field inside a gridview to a textbox which is inside the gridview as well. I'm intending to do this for editing the table.

我在将 gridview 内的字段值绑定到 gridview 内的文本框时遇到问题。我打算这样做来编辑表格。

I tried to do this with eval and bind, but the textbox won't show the values and I have absolutely no clue why.

我试图用 eval 和 bind 来做到这一点，但文本框不会显示值，我完全不知道为什么。

<asp:UpdatePanel runat="server">
    <ContentTemplate>
        <asp:GridView ID="gvBS" runat="server" AutoGenerateColumns="false" DataKeyNames="ID" SkinID="gvWithoutWidth">
         <Columns>
            <asp:CommandField ShowEditButton="true" EditImageUrl="~/Images/GridView/gv_edit.png" ButtonType="Image" 
                CancelImageUrl="~/Images/GridView/gv_cancel.png" UpdateImageUrl="~/Images/GridView/gv_update.png"/>
            <asp:TemplateField HeaderText="Sollmonat" HeaderStyle-HorizontalAlign="Left">
                <EditItemTemplate>
                    <asp:TextBox ID="tbSollMonat" runat="server" Text='<%# Eval("SollMonat") %>'></asp:TextBox>
                    <asp:RequiredFieldValidator ID="rfvSollMonat" ValidationGroup="Update" runat="server"
                        ControlToValidate="tbSollMonat" ErrorMessage="Bitte Sollmonat (dd.mm.yyyy) angeben"
                        SetFocusOnError="true">*</asp:RequiredFieldValidator> 
                    <asp:RegularExpressionValidator ID="revSollMonat" ValidationGroup="Update" runat="server"
                        ValidationExpression="^\d+$" ControlToValidate="tbSollMonat">*</asp:RegularExpressionValidator>
                </EditItemTemplate>
                <ItemTemplate>
                    <%# Eval("SollMonat")%>
                </ItemTemplate>
            </asp:TemplateField>
            </Columns>
        </asp:GridView>
    </ContentTemplate>
</asp:UpdatePanel>

The thing is that it works fine inside the ItemTemplate, but doesn't inside the EditItemTemplate-element. Really no clue what the problem is.

问题是它在 ItemTemplate 内工作正常，但不在 EditItemTemplate 元素内。真的不知道是什么问题。

Code behind:

后面的代码：

Sub gvBS_RowEditing(ByVal sender As Object, ByVal e As GridViewEditEventArgs) Handles gvBS.RowEditing
        gvBS.EditIndex = e.NewEditIndex
    End Sub

    Sub gvBS_RowCancelingEdit() Handles gvBS.RowCancelingEdit
        Me.gvBS.EditIndex = -1
        gvBS_DataBind()
    End Sub

回答by Tim Schmelter

I assume that the GridViewenters never edit-mode since you aren't handling the RowEditingevent or you didn't DataBindit after you've set gvBS.EditIndex = e.NewEditIndex;.

我假设GridView进入永远不会编辑模式，因为您没有处理该RowEditing事件，或者DataBind您在设置gvBS.EditIndex = e.NewEditIndex;.

<asp:GridView 
    OnRowEditing="gvBS_RowEditing" OnRowCancelingEdit="gvBS_RowCancelingEdit"
    ID="gvBS" runat="server" AutoGenerateColumns="false" 
    DataKeyNames="ID" SkinID="gvWithoutWidth">

codebehind (BindGridis the method which databinds your grid):

代码隐藏（BindGrid是数据绑定网格的方法）：

protected void gvBS_RowEditing(object sender, GridViewEditEventArgs e)
{
    gvBS.EditIndex = e.NewEditIndex;
    BindGrid();
}

protected void gvBS_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
    gvBS.EditIndex = -1;
    BindGrid();
}

You should also remember to databind it only on the first load, not on consecutive postbacks when ViewStateis enabled(default). Therefore you can check the page's IsPostBackproperty:

您还应该记住仅在第一次加载时对其进行数据绑定，而不是在ViewState启用（默认）时连续回发。因此，您可以检查页面的IsPostBack属性：

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGrid();
    }
}

回答by Prashant16

Try the Bind instead of Eval in EditItemTemplate like this

像这样在 EditItemTemplate 中尝试 Bind 而不是 Eval

<asp:UpdatePanel runat="server">
<ContentTemplate>
    <asp:GridView ID="gvBS" runat="server" AutoGenerateColumns="false" DataKeyNames="ID" SkinID="gvWithoutWidth">
     <Columns>
        <asp:CommandField ShowEditButton="true" EditImageUrl="~/Images/GridView/gv_edit.png" ButtonType="Image" 
            CancelImageUrl="~/Images/GridView/gv_cancel.png" UpdateImageUrl="~/Images/GridView/gv_update.png"/>
        <asp:TemplateField HeaderText="Sollmonat" HeaderStyle-HorizontalAlign="Left">
            <EditItemTemplate>
                <asp:TextBox ID="tbSollMonat" runat="server" Text='<%# Bind("SollMonat") %>'></asp:TextBox>
                <asp:RequiredFieldValidator ID="rfvSollMonat" ValidationGroup="Update" runat="server"
                    ControlToValidate="tbSollMonat" ErrorMessage="Bitte Sollmonat (dd.mm.yyyy) angeben"
                    SetFocusOnError="true">*</asp:RequiredFieldValidator> 
                <asp:RegularExpressionValidator ID="revSollMonat" ValidationGroup="Update" runat="server"
                    ValidationExpression="^\d+$" ControlToValidate="tbSollMonat">*</asp:RegularExpressionValidator>
            </EditItemTemplate>
            <ItemTemplate>
                <%# Eval("SollMonat")%>
            </ItemTemplate>
        </asp:TemplateField>
        </Columns>
    </asp:GridView>
</ContentTemplate>