Question

我在处理更新gridview的功能时遇到问题。到目前为止，我一直在使用DataSource控件，但这次我需要从头开始构建所有内容。我希望能够只更新gridview的最后一个数据列。我的问题是： 1）当我单击编辑按钮时，行中的所有数据字段都会转换为文本框 - 我只想最后一个这样做 2）当我点击更新时，我得到“对象引用未设置为对象的实例”。错误，似乎“TextBox tProgress =（TextBox）grdMilestones.Rows [e.RowIndex] .Cells [3] .FindControl（”mstCompletition“）;”只是找不到正确的值，因为当我用数字替换它时，它可以正常工作。

这是我的gridview

<asp:GridView ID="grdMilestones" runat="server" Width="940px" DataKeyNames="mstNo"
    OnRowEditing="grdMilestones_RowEditing"         
    OnRowCancelingEdit="grdMilestones_RowCancelingEdit" 
    OnRowUpdating="grdMilestones_RowUpdating" AutoGenerateColumns="False" 
    CssClass="milestonesGrid">
  <Columns>
  <asp:BoundField DataField="proName" HeaderText="Project Name" />
  <asp:BoundField DataField="mstDescription" HeaderText="Milestone Description" />
  <asp:BoundField DataField="mstPersResp" HeaderText="Milestone Leader" />
  <asp:BoundField DataField="mstCompletition" HeaderText="Progress" DataFormatString{0:F1}%" />     
  <asp:CommandField ButtonType="Button" ShowEditButton="true" EditText="Update progress" />
  </Columns>
</asp:GridView>

背后的代码

protected void grdMilestones_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    int id = Int32.Parse(grdMilestones.DataKeys[e.RowIndex].Value.ToString());

    TextBox tProgress = (TextBox)grdMilestones.Rows[e.RowIndex].Cells[3].FindControl("mstCompletition");
    int prog = Convert.ToInt32(tProgress.Text.Trim());

    //ds.Rows[row.DataItemIndex]["mstCompletition"] = ((TextBox)(row.Cells[1].Controls[0])).Text;

    string updateSQL = "UPDATE milestonesPM SET mstCompletition = @mstCompletition WHERE mstNo = @mstNo";
    SqlConnection con = new SqlConnection(connectionString);
    SqlCommand cmd = new SqlCommand(updateSQL, con);
    cmd.Parameters.Add("@mstNo", SqlDbType.Int).Value = id;
    cmd.Parameters.Add("@mstCompletition", SqlDbType.SmallInt).Value = prog;

    con.Open();

    cmd.ExecuteNonQuery();
    grdMilestones.EditIndex = -1;
    grdMilestones.DataBind();

    con.Close();

    fillGrid();
}

此致

的Bartosz

Answer 1

您需要将您不想编辑的列设为只读，并为要编辑的列创建EditItemTemplate：

<asp:BoundField DataField="proName" 
        ReadOnly="true"
        HeaderText="Project Name" />
<asp:TemplateField HeaderText="Progress">
    <ItemTemplate>
        <asp:Label ID="mstCompletitionLabel" Text='<%# Eval("Description") %>' 
            runat="server" />
    </ItemTemplate>
    <EditItemTemplate>
        <asp:TextBox ID="mstCompletitionTextBox" CssClass="textBox"
            runat="server"
            TabIndex="12"
            Width="175"
            Text='<%# Eval("mstCompletition") %>' 
            MaxLength="20">
        </asp:TextBox>
        <asp:RequiredFieldValidator ID="mstCompletitionValidator" 
            runat="server"
            ErrorMessage="Required"
            Text="*" 
            ControlToValidate="mstCompletitionTextBox"
            SetFocusOnError="true"
            Display="Static">
       </asp:RequiredFieldValidator>                                                      
    </EditItemTemplate>
</asp:TemplateField>

asp.net更新gridview问题

1 个答案: