使用 CheckBoxList 控件和 TextBox 在 GridView 中添加新行

Question

我正在使用带有两个文本框控件和一个复选框列表控件的网格视图。当我在网格视图中动态添加新行时，两个文本框包含上一行中的值，但 checkboxlist 控件中的项目未显示在上一行中。我想保持上一行中 checkboxlist 的状态.这个怎么做？谁能给点建议？

     private void FirstGridViewRow()
 {
     DataTable dt = new DataTable();
     DataRow dr = null;
     dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
     dt.Columns.Add(new DataColumn("Col1", typeof(string)));
     dt.Columns.Add(new DataColumn("Col2", typeof(string)));
     dt.Columns.Add(new DataColumn("Col3", typeof(string)));
     dt.Columns.Add(new DataColumn("Col4", typeof(string)));
     dt.Columns.Add(new DataColumn("Col5", typeof(string)));
     dr = dt.NewRow();
     dr["RowNumber"] = 1;
     dr["Col1"] = string.Empty;
     dr["Col2"] = string.Empty;
     dr["Col3"] = string.Empty;
     dr["Col4"] = string.Empty;
     dr["Col5"] = string.Empty;
     dt.Rows.Add(dr);

     ViewState["CurrentTable"] = dt;

     grvStudentDetails.DataSource = dt;
     grvStudentDetails.DataBind();
 }



 private void AddNewRowbutton_click()
 {
     int rowIndex = 0;

     if (ViewState["CurrentTable"] != null)
     {
         DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
         DataRow drCurrentRow = null;
         if (dtCurrentTable.Rows.Count > 0)
         {
             for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
             {
                 TextBox actionitemname =
                   (TextBox)grvStudentDetails.Rows[rowIndex].Cells[1].FindControl("txtName");
                 TextBox actionduedate =
                   (TextBox)grvStudentDetails.Rows[rowIndex].Cells[2].FindControl("txtAge");
                 CheckBoxList assignee = (CheckBoxList)grvStudentDetails.Rows[rowIndex].Cells[5].FindControl("chkAssignees");
                 drCurrentRow = dtCurrentTable.NewRow();
                 drCurrentRow["RowNumber"] = i + 1;

                 dtCurrentTable.Rows[i - 1]["Col1"] = actionitemname.Text;
                 dtCurrentTable.Rows[i - 1]["Col2"] = actionduedate.Text;
                 //dtCurrentTable.Rows[i - 1]["Col5"] = assignee.SelectedItem.Text;
                 rowIndex++;
             }
             dtCurrentTable.Rows.Add(drCurrentRow);
             ViewState["CurrentTable"] = dtCurrentTable;
             grvStudentDetails.DataSource = dtCurrentTable;
             grvStudentDetails.DataBind();
         }
     }
     else
     {
         Response.Write("ViewState is null");
     }
     SetPreviousData();
 }

     private void SetPreviousData()
 {
     int rowIndex = 0;
     if (ViewState["CurrentTable"] != null)
     {
         DataTable dt = (DataTable)ViewState["CurrentTable"];
         if (dt.Rows.Count > 0)
         {
             for (int i = 0; i < dt.Rows.Count; i++)
             {
                 TextBox TextBoxName = (TextBox)grvStudentDetails.Rows[rowIndex].Cells[1].FindControl("txtName");
                 TextBox TextBoxAge = (TextBox)grvStudentDetails.Rows[rowIndex].Cells[2].FindControl("txtAge");
                 TextBoxName.Text = dt.Rows[i]["Col1"].ToString();
                 TextBoxAge.Text = dt.Rows[i]["Col2"].ToString();
                 rowIndex++;
             }
         }
     }
 }

Answer 1

您可以按照here 显示的示例进行操作。

在 aspx 中：

<div>
<asp:gridview ID="Gridview1" runat="server" ShowFooter="true" AutoGenerateColumns="false">
        <Columns>
        <asp:BoundField DataField="RowNumber" HeaderText="Row Number" />
        <asp:TemplateField HeaderText="Header 1">
            <ItemTemplate>
                <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Header 2">
            <ItemTemplate>
                <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Header 3">
            <ItemTemplate>
                 <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
            </ItemTemplate>
         </asp:TemplateField>
             <asp:TemplateField HeaderText="Header 4">
            <ItemTemplate>
                 <asp:CheckBox ID="CheckBox1" runat="server"></asp:CheckBox>
            </ItemTemplate>
            <FooterStyle HorizontalAlign="Right" />
            <FooterTemplate>
             <asp:Button ID="ButtonAdd" runat="server" Text="Add New Row" 
                    onclick="ButtonAdd_Click" />
            </FooterTemplate>
        </asp:TemplateField>
        </Columns>
    </asp:gridview>
</div>

在 .cs 文件中：

 private void SetInitialRow()
    {
        DataTable dt = new DataTable();
        DataRow dr = null;
        dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
        dt.Columns.Add(new DataColumn("Column1", typeof(string)));
        dt.Columns.Add(new DataColumn("Column2", typeof(string)));
        dt.Columns.Add(new DataColumn("Column3", typeof(string)));
        dt.Columns.Add(new DataColumn("Column4", typeof(string)));

        dr = dt.NewRow();
        dr["RowNumber"] = 1;
        dr["Column1"] = string.Empty;
        dr["Column2"] = string.Empty;
        dr["Column3"] = string.Empty;
        dr["Column4"] = string.Empty;
        dt.Rows.Add(dr);

        //Store the DataTable in ViewState
        ViewState["CurrentTable"] = dt;

        Gridview1.DataSource = dt;
        Gridview1.DataBind();
    }

    private void AddNewRowToGrid()
    {
        int rowIndex = 0;

        if (ViewState["CurrentTable"] != null)
        {
            DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
            DataRow drCurrentRow = null;
            if (dtCurrentTable.Rows.Count > 0)
            {
                for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                {
                    //extract the TextBox values
                    TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                    TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
                    TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("TextBox3");
                    CheckBox chkBx = (CheckBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("CheckBox1");

                    drCurrentRow = dtCurrentTable.NewRow();
                    drCurrentRow["RowNumber"] = i + 1;

                    dtCurrentTable.Rows[i - 1]["Column1"] = box1.Text;
                    dtCurrentTable.Rows[i - 1]["Column2"] = box2.Text;
                    dtCurrentTable.Rows[i - 1]["Column3"] = box3.Text;
                    dtCurrentTable.Rows[i - 1]["Column4"] = chkBx.Checked.ToString();

                    rowIndex++;
                }

                dtCurrentTable.Rows.Add(drCurrentRow);
                ViewState["CurrentTable"] = dtCurrentTable;

                Gridview1.DataSource = dtCurrentTable;
                Gridview1.DataBind();
            }
        }
        else
        {
            Response.Write("ViewState is null");
        }

        //Set Previous Data on Postbacks
        SetPreviousData();
    }

    private void SetPreviousData()
    {
        int rowIndex = 0;
        if (ViewState["CurrentTable"] != null)
        {
            DataTable dt = (DataTable)ViewState["CurrentTable"];
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                    TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
                    TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("TextBox3");
                    CheckBox chkBx = (CheckBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("CheckBox1");

                    box1.Text = dt.Rows[i]["Column1"].ToString();
                    box2.Text = dt.Rows[i]["Column2"].ToString();
                    box3.Text = dt.Rows[i]["Column3"].ToString();


                    chkBx.Checked = dt.Rows[i]["Column4"].ToString().ToUpperInvariant()=="TRUE";

                    rowIndex++;
                }
            }
        }
    }

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

    protected void ButtonAdd_Click(object sender, EventArgs e)
    {
        AddNewRowToGrid();
    }