Question

我正在尝试制作一个简单的Gridview应用程序，我在互联网上找到了一个例子并进行了一些更改。我有一个问题，我对一件事感到困惑。问题是我无法在编辑模式下向gridview添加数据。我在Gridview RowCommand Property中设置了一个断点，发现所有文本框值都是空的。这可能是一个愚蠢的错误，但我不知道它在哪里。还有一件事，在添加数据时我们使用此代码：

(e.CommandName.Equals("ADD"))

我不明白，但代码中没有(e.CommandName.Equals("Update"))或类似内容。在这种情况下如何触发更新按钮？

提前致谢。

这是我的代码：

<asp:GridView ID="gvEmployeeDetails" runat="server" Width="600px" 
     AutoGenerateColumns="false" ShowFooter="true"
     onrowcommand="gvEmployeeDetails_RowCommand" 
     onrowdeleting="gvEmployeeDetails_RowDeleting" 
     onrowupdating="gvEmployeeDetails_RowUpdating" 
     onrowcancelingedit="gvEmployeeDetails_RowCancelingEdit" 
     onrowediting="gvEmployeeDetails_RowEditing"
     HeaderStyle-BackColor="#4D4D4D"
     HeaderStyle-ForeColor="White">
     <Columns>            
         <asp:TemplateField HeaderText="Employee ID">
             <ItemTemplate>
                 <asp:Label ID="lblEmpID" 
                     runat="server" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "empid") %>'>
                 </asp:Label>
             </ItemTemplate>
             <EditItemTemplate>            
                 <asp:Label ID="lblEditEmpID" 
                     runat="server" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "empid") %>'>
                 </asp:Label>            
             </EditItemTemplate>
             <FooterTemplate>
                 <asp:TextBox ID="txtAddEmpID" runat="server" Width="100px">
                 </asp:TextBox>
             </FooterTemplate>
         </asp:TemplateField>

         <asp:TemplateField HeaderText="Name">
             <ItemTemplate>
                 <asp:Label ID="lblName" runat="server" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "name") %>'>
                 </asp:Label>
             </ItemTemplate>
             <EditItemTemplate>            
                 <asp:TextBox ID="txtEditName" runat="server" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "name") %>'>
                 </asp:TextBox>            
             </EditItemTemplate>
             <FooterTemplate>
                 <asp:TextBox ID="txtAddName" runat="server" Width="100px">
                 </asp:TextBox>
             </FooterTemplate>
         </asp:TemplateField>

         <asp:TemplateField HeaderText="Designation">
             <ItemTemplate>
                 <asp:Label ID="lblDesignation" runat="server" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "designation") %>'>
                 </asp:Label>
             </ItemTemplate>
             <EditItemTemplate>            
                 <asp:TextBox ID="txtEditDesignation" runat="server" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "designation") %>'>
                 </asp:TextBox>            
             </EditItemTemplate>
             <FooterTemplate>
                 <asp:TextBox ID="txtAddDesignation" runat="server" Width="150px">
                 </asp:TextBox>
             </FooterTemplate>
         </asp:TemplateField>

         <asp:TemplateField HeaderText="City">
             <ItemTemplate>
                 <asp:Label ID="lblCity" runat="server"
                     Text='<%#DataBinder.Eval(Container.DataItem, "city") %>'>
                 </asp:Label>
             </ItemTemplate>
             <EditItemTemplate>            
                 <asp:TextBox ID="txtEditCity" runat="server" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "city") %>'>
                 </asp:TextBox>            
             </EditItemTemplate>
             <FooterTemplate>
                 <asp:TextBox ID="txtAddCity" runat="server" Width="80px">
                 </asp:TextBox>
             </FooterTemplate>
         </asp:TemplateField>

         <asp:TemplateField HeaderText="Country">
             <ItemTemplate>
                 <asp:Label ID="lblCountry" runat="server" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "country") %>'>
                 </asp:Label>
             </ItemTemplate>
             <EditItemTemplate>            
                 <asp:TextBox ID="txtEditCountry" runat="server" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "country") %>'>
                 </asp:TextBox>            
             </EditItemTemplate>
             <FooterTemplate>
                 <asp:TextBox ID="txtAddCountry" runat="server" Width="80px">
                 </asp:TextBox>
             </FooterTemplate>
         </asp:TemplateField>

         <asp:TemplateField HeaderText="Action">
             <ItemTemplate>
                 <asp:ImageButton ID="imgbtnEdit" runat="server" CommandName="Edit" 
                     ImageUrl="~/Images/icon-edit.png" Height="32px" Width="32px"/>
                 <asp:ImageButton ID="imgbtnDelete" runat="server" CommandName="Delete" 
                     ImageUrl="~/Images/Delete.png"/>
             </ItemTemplate>
             <EditItemTemplate>
                 <asp:ImageButton ID="imgbtnUpdate" runat="server" CommandName="Update" 
                     ImageUrl="~/Images/icon-update.png"/>
                 <asp:ImageButton ID="imgbtnCancel" runat="server" CommandName="Cancel" 
                     ImageUrl="~/Images/icon-Cancel.png"/>
             </EditItemTemplate>
             <FooterTemplate>
                 <asp:LinkButton ID="lbtnAdd" runat="server" CommandName="ADD" 
                     Text="Add" Width="80px">
                 </asp:LinkButton> 
              </FooterTemplate>
          </asp:TemplateField>

      </Columns>            
  </asp:GridView>

这是aspx.cs文件：

SqlConnection conn = new SqlConnection("Data Source=localhost\\sqlexpress;Database=Northwind;User Id=sa ;Password=1234");
    protected void Page_Load(object sender, EventArgs e)
    {
        BindData();
    }

    void BindData() {

        DataSet ds = new DataSet();
        DataTable FromTable = new DataTable();
        string cmd = "select * from EmployeeDetails";

        SqlDataAdapter adp = new SqlDataAdapter(cmd, conn);
        adp.Fill(ds);
        FromTable = ds.Tables[0];

        if (FromTable.Rows.Count > 0)
        {
            gvEmployeeDetails.DataSource = FromTable;
            gvEmployeeDetails.DataBind();
        }
        else {
            FromTable.Rows.Add(FromTable.NewRow());
            gvEmployeeDetails.DataSource = FromTable;
            gvEmployeeDetails.DataBind();
            int TotalColumns = gvEmployeeDetails.Rows[0].Cells.Count;
            gvEmployeeDetails.Rows[0].Cells.Clear();
            gvEmployeeDetails.Rows[0].Cells.Add(new TableCell());
            gvEmployeeDetails.Rows[0].Cells[0].ColumnSpan = TotalColumns;
            gvEmployeeDetails.Rows[0].Cells[0].Text = "No records Found";
        }
    }
    protected void gvEmployeeDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {

///不要发布这部分它的作品

    }
    protected void gvEmployeeDetails_RowEditing(object sender, GridViewEditEventArgs e)
    {
        gvEmployeeDetails.EditIndex = e.NewEditIndex;
        BindData();
    }
    protected void gvEmployeeDetails_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {

    }
    protected void gvEmployeeDetails_RowCommand(object sender, GridViewCommandEventArgs e)
    {

        if (e.CommandName.Equals("ADD"))
        {
            TextBox txtAddEmpID = (TextBox)gvEmployeeDetails.FooterRow.FindControl("txtAddEmpID");
            TextBox txtAddName = (TextBox)gvEmployeeDetails.FooterRow.FindControl("txtAddName");
            TextBox txtAddDesignation = (TextBox)gvEmployeeDetails.FooterRow.FindControl("txtAddDesignation");
            TextBox txtAddCity = (TextBox)gvEmployeeDetails.FooterRow.FindControl("txtAddCity");
            TextBox txtAddCountry = (TextBox)gvEmployeeDetails.FooterRow.FindControl("txtAddCountry");

            conn.Open();
            string cmdstr = "insert  EmployeeDetails values(@empid,@name,@designation,@city,@country)";
            SqlCommand cmd = new SqlCommand(cmdstr, conn);
            cmd.Parameters.AddWithValue("@empid", txtAddEmpID.Text);
            cmd.Parameters.AddWithValue("@name", txtAddName.Text);
            cmd.Parameters.AddWithValue("@designation", txtAddDesignation.Text);
            cmd.Parameters.AddWithValue("@city", txtAddCity.Text);
            cmd.Parameters.AddWithValue("@country", txtAddCountry.Text);
            cmd.ExecuteNonQuery();
            conn.Close();
            BindData();
        }       
    }
    protected void gvEmployeeDetails_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        gvEmployeeDetails.EditIndex = -1;
    }

Answer 1

您正在页面加载上绑定gridview，因此每次页面加载文本和其他控件都会被清除。只有在没有ispostback的情况下才能绑定数据并检查吗？

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

关于你的问题，您有一个带有命令名称编辑的链接按钮。这是网格视图用于触发所选行的编辑模式的命令的名称。你可以在这里添加任何类型的命令控件，只要命令名称为“编辑”，编辑模式就会被触发。如果你没有添加这个控件，并设置AutoGenerateEditButton = true，那么默认情况下gridview将生成并编辑按钮，并使用“Edit”作为命令名称。

无法将数据添加到Gridview

1 个答案: