Question

我有以下数据库设计：

Employee Table: Username, Name, JobTitle, BadgeNo, IsActive, DivisionCode
Divisions Table: SapCode, DivisionShortcut

我有一个GridView，我用它来添加，删除和更新/编辑员工信息。此信息是员工用户名，名称，BadgeNo，JobTitle，IsActive和DivisionShortcut。 IsActive是一个标志，指示员工是否可用或在作业中 。我把它作为一个复选框，列应该显示两个值;主动和非主动。在编辑模式下，将显示复选框。如果选中它，则表示员工可以使用，否则表示处于非活动状态。

我编写了代码，一切正常，但现在我遇到了两个问题，我不知道如何使用我的代码。

GridView显示True或False，而不是Active和Inactive 我不知道为什么。
在编辑模式下，将显示复选框，除此之外将显示值（活动或非活动），不应显示。我只想要显示复选框。

那么如何修改它们呢？

enter image description here

ASP.NET代码：

<%-- GridView for User Management Subsystem --%>
        <asp:GridView ID="GridView1" runat="server" AllowSorting="True" 
            AutoGenerateColumns="False" DataKeyNames="Username" 
            DataSourceID="SqlDataSource1" BorderWidth="1px" BackColor="#DEBA84" 
             CellPadding="3" CellSpacing="2" BorderStyle="None" 
             BorderColor="#DEBA84">
            <FooterStyle ForeColor="#8C4510" 
              BackColor="#F7DFB5"></FooterStyle>
            <PagerStyle ForeColor="#8C4510" 
              HorizontalAlign="Center"></PagerStyle>
            <HeaderStyle ForeColor="White" Font-Bold="True" 
              BackColor="#A55129"></HeaderStyle>
            <Columns>
                <asp:CommandField ButtonType="Image" ShowEditButton="true" ShowCancelButton="true"
                                EditImageUrl="Images/icons/edit24.png" UpdateImageUrl="Images/icons/update24.png" 
                                CancelImageUrl="Images/icons/cancel324.png" />

                <asp:TemplateField HeaderText="Division">
                    <ItemTemplate>
                        <%# Eval("DivisionShortcut")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:DropDownList ID="DivisionsList" runat="server" DataSourceID="DivisionsListDataSource"
                                          DataTextField="DivisionShortcut" DataValueField="SapCode"
                                          SelectedValue='<%# Bind("DivisionCode")%>'>
                        </asp:DropDownList>
                    </EditItemTemplate>
                </asp:TemplateField>

                <asp:BoundField DataField="Username" HeaderText="Network ID" ReadOnly="True" 
                    SortExpression="Username" />

                <asp:TemplateField HeaderText="Name">
                    <ItemTemplate>
                        <%# Eval("Name")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox ID="txtEmployeeName" runat="server" Text='<%# Bind("Name")%>' />
                    </EditItemTemplate>
                </asp:TemplateField>

                <asp:TemplateField HeaderText="Job Title">
                    <ItemTemplate>
                        <%# Eval("JobTitle")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox ID="txtJobTitle" runat="server" Text='<%# Bind("JobTitle")%>' />
                    </EditItemTemplate>
                </asp:TemplateField>

                <asp:TemplateField HeaderText="Badge No.">
                    <ItemTemplate>
                        <%# Eval("BadgeNo")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox ID="txtBadgeNo" runat="server" Text='<%# Bind("BadgeNo")%>' />
                    </EditItemTemplate>
                </asp:TemplateField>

                <asp:TemplateField HeaderText="Is Active?">
                    <ItemTemplate>
                        <%# Eval("IsActive")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:CheckBox ID="isActive" runat="server" 
                                      AutoPostBack="true" OnCheckedChanged="isActive_OnCheckedChanged"
                                      Checked='<%# Convert.ToBoolean(Eval("IsActive")) %>'
                                      Text='<%# Eval("IsActive").ToString().Equals("True") ? " Active " : " Inactive " %>'/>
                    </EditItemTemplate>
                </asp:TemplateField>

                <asp:TemplateField HeaderText="Delete?">
                    <ItemTemplate>
                        <span onclick="return confirm('Are you sure to Delete the record?')">
                            <asp:ImageButton ID="lnkB" runat="server" ImageUrl="Images/icons/delete24.png" CommandName="Delete" />
                        </span>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

代码隐藏：

//for updating the (IsActive) column using checkbox inside the GridView
    protected void isActive_OnCheckedChanged(object sender, EventArgs e)
    {
        CheckBox chkStatus = (CheckBox)sender;
        GridViewRow gvrow = (GridViewRow)chkStatus.NamingContainer;

        //Get the ID which is the NetworkID of the employee
        string username = gvrow.Cells[2].Text;
        bool status = chkStatus.Checked;

        string connString = ConfigurationManager.ConnectionStrings["UsersInfoDBConnectionString"].ConnectionString;
        SqlConnection conn = new SqlConnection(connString);

        string updateIsActive = "UPDATE Employee SET IsActive = @IsActive WHERE Username = @Username";

        SqlCommand cmd = new SqlCommand(updateIsActive, conn);

        cmd.Parameters.AddWithValue("@IsActive", status);
        cmd.Parameters.AddWithValue("@Username", username);

        try
        {
            conn.Open();
            cmd.ExecuteNonQuery();
            conn.Close();
        }
        catch (SqlException se)
        {
            throw se;
        }
        finally
        {
            cmd.Dispose();
            conn.Close();
            conn.Dispose();
        }
    }

更新

我将代码更新如下： ASP.NET代码：

<asp:GridView ID="GridView1" runat="server" AllowSorting="True" 
            AutoGenerateColumns="False" DataKeyNames="Username" 
            DataSourceID="SqlDataSource1" OnRowDataBound="GridView1_RowDataBound" BorderWidth="1px" BackColor="#DEBA84" 
             CellPadding="3" CellSpacing="2" BorderStyle="None" 
             BorderColor="#DEBA84">
            <FooterStyle ForeColor="#8C4510" 
              BackColor="#F7DFB5"></FooterStyle>
            <PagerStyle ForeColor="#8C4510" 
              HorizontalAlign="Center"></PagerStyle>
            <HeaderStyle ForeColor="White" Font-Bold="True" 
              BackColor="#A55129"></HeaderStyle>
            <Columns>
                <asp:CommandField ButtonType="Image" ShowEditButton="true" ShowCancelButton="true"
                                EditImageUrl="Images/icons/edit24.png" UpdateImageUrl="Images/icons/update24.png" 
                                CancelImageUrl="Images/icons/cancel324.png" />

                <asp:TemplateField HeaderText="Division">
                    <ItemTemplate>
                        <%# Eval("DivisionShortcut")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:DropDownList ID="DivisionsList" runat="server" DataSourceID="DivisionsListDataSource"
                                          DataTextField="DivisionShortcut" DataValueField="SapCode"
                                          SelectedValue='<%# Bind("DivisionCode")%>'>
                        </asp:DropDownList>
                    </EditItemTemplate>
                </asp:TemplateField>

                <asp:BoundField DataField="Username" HeaderText="Network ID" ReadOnly="True" 
                    SortExpression="Username" />

                <asp:TemplateField HeaderText="Name">
                    <ItemTemplate>
                        <%# Eval("Name")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox ID="txtEmployeeName" runat="server" Text='<%# Bind("Name")%>' />
                    </EditItemTemplate>
                </asp:TemplateField>

                <asp:TemplateField HeaderText="Job Title">
                    <ItemTemplate>
                        <%# Eval("JobTitle")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox ID="txtJobTitle" runat="server" Text='<%# Bind("JobTitle")%>' />
                    </EditItemTemplate>
                </asp:TemplateField>

                <asp:TemplateField HeaderText="Badge No.">
                    <ItemTemplate>
                        <%# Eval("BadgeNo")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox ID="txtBadgeNo" runat="server" Text='<%# Bind("BadgeNo")%>' />
                    </EditItemTemplate>
                </asp:TemplateField>

                <asp:TemplateField HeaderText="Is Active?">
                    <ItemTemplate>
                        <asp:Label ID="lblIsActive" runat="server" Text='<%# Eval("IsActive")%>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:CheckBox ID="isActive" runat="server" 
                                      AutoPostBack="true" OnCheckedChanged="isActive_OnCheckedChanged"
                                      Checked='<%# Convert.ToBoolean(Eval("IsActive")) %>'
                                      Text='<%# Eval("IsActive")%>'/>
                    </EditItemTemplate>
                </asp:TemplateField>

                <asp:TemplateField HeaderText="Delete?">
                    <ItemTemplate>
                        <span onclick="return confirm('Are you sure to Delete the record?')">
                            <asp:ImageButton ID="lnkB" runat="server" ImageUrl="Images/icons/delete24.png" CommandName="Delete" />
                        </span>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

代码隐藏：

//For showing Active or Inactive in the IsActive column instead of True or False
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            //Here we will select the IsActive column and modify its text
            Label isActive = new Label();
            isActive = (Label)e.Row.FindControl("lblIsActive");
            //Now, after getting the reference, we can set its text
            isActive.Text = "Active or Inactive";

            // First check Checkedbox is check or not, if not make it grey
            //if (e.Row.Cells[6].Text == "False")
            //    GridView1.BackColor = Color.Gray;

        }
    }

我收到以下错误，我不知道原因： enter image description here

Answer 1

问题编号：1 您必须在网格视图中添加Row_DataBound事件，在其中选择IsActive列并将其文本替换为Active和InActive。但在进入代码之前对aspx代码进行一些改动：在你的项目模板而不是直接绑定中放置一个标签控件并将其绑定，就像我在下面的代码中所做的那样：

<asp:TemplateField HeaderText="Is Active?">
                <ItemTemplate>
                      <asp:Label ID="lblIsActive" runat="server" Text='<%# Eval("IsActive") %>' ></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:CheckBox ID="isActive" runat="server" 
                                  AutoPostBack="true" OnCheckedChanged="isActive_OnCheckedChanged"
                                  Checked='<%# Convert.ToBoolean(Eval("IsActive")) %>'
                                  Text='<%# Eval("IsActive").ToString().Equals("True") ? " Active " : " Inactive " %>'/>
                </EditItemTemplate>
            </asp:TemplateField>

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        // here you will select the IsActive column and modify it's text
        Label isActive=new Label();
        isActive = (Label) e.row.FindControl("lblIsActive");
        // after getting the reference set its text
        isActive.Text="Active or InActive";            

    }
}

问题2：从此

中删除条件

Eval("IsActive").ToString().Equals("True") ? " Active " : " Inactive " %>'

并将其替换为

 Eval("IsActive")

现在将显示复选框。

更新答案： You are receiving an object reference not found error, Please debug your site and check it why you are unable to get the exact reference. I saw you code and it looks that your code is fine. 为了证明我的代码有效，我创建了一个带有单列的网格视图

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnRowDataBound="GridView1_RowDataBound">
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                     <asp:Label ID="Label1" runat="server" Text='<%# Bind("name") %>'></asp:Label>
                </ItemTemplate>                   
            </asp:TemplateField>
        </Columns>            
    </asp:GridView>
    // and bind this grid view in the Page_Load of my Page
    protected void Page_Load(object sender, EventArgs e)
    { 
    DataTable dt = new DataTable();
    dt.Columns.Add("name");

    DataRow row = dt.NewRow();
    row[0] = "Waqar Janjua";
    dt.Rows.Add(row);

    GridView1.DataSource = dt;
    GridView1.DataBind();
    }

    // When I view this page in the browser it shows "Waqar Janjua"
    // Now to update the columns text, I add the following code and it works.
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
      if (e.Row.RowState != DataControlRowState.Edit)
      {
      if (e.Row.RowType == DataControlRowType.DataRow)
      {
        Label l = new Label();
        l = (Label)e.Row.FindControl("Label1");
        l.Text = "waqar";           
       }
      }
    }

   // When I run this page now, it shows me "Waqar" not "Waqar Janjua" The code works for me.

Answer 2

它返回“true”或“false”，因为它期望来自IsActive的布尔数据类型。如果你想改变那个输出，我怀疑你需要在网格的ItemDataBound事件上有条件地修改它。

如何在GridView中修改此复选框？

2 个答案: