動態加載Gridview不顯示和數據

Question

我正在嘗試從Active Directory檢索的數據加載網格。 我將GridView設置如下。 問題是正在創建記錄，但未顯示數據

<asp:gridview ID="Gridview1" runat="server" ShowFooter="true" AutoGenerateColumns="false" AllowPaging="True" Visible="false"
    BackColor="White" BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px" CellPadding="4" 
    style ="z-index: 2; left: 65px; top:355px; position: absolute; height: 221px; width: 1158px">
    <Columns>
        <asp:BoundField DataField="RowNumber" HeaderText="Row Number" />
        <asp:TemplateField HeaderText="Employee No">
            <ItemTemplate>
                <asp:Label ID="EmployeeNo" runat="server" style="color:blue"></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Name">
            <ItemTemplate>
                <asp:Label ID="DisplayName" runat="server"></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Department">
            <ItemTemplate>
                 <asp:Label ID="Department" runat="server"></asp:Label>
            </ItemTemplate>           
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Job Title">
            <ItemTemplate>
                <asp:Label ID="JobTitle" runat="server"></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Manager">
            <ItemTemplate>
                <asp:Label ID="Manager" runat="server"></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Employee ID">
            <ItemTemplate>
                 <asp:Label ID="Name" runat="server"></asp:Label>
            </ItemTemplate>           
        </asp:TemplateField>
    </Columns>
</asp:gridview>

我在收集活動數據之前運行以下功能

    private void SetInitialRow()
    {
        DataTable dt = new DataTable();
        DataRow dr = null;
        dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
        dt.Columns.Add(new DataColumn("EmployeeNo", typeof(string)));
        dt.Columns.Add(new DataColumn("DisplayName", typeof(string)));
        dt.Columns.Add(new DataColumn("Department", typeof(string)));
        dt.Columns.Add(new DataColumn("JobTitle", typeof(string)));
        dt.Columns.Add(new DataColumn("Manager", typeof(string)));
        dt.Columns.Add(new DataColumn("Name", typeof(string)));
        dr = dt.NewRow();
        dr["RowNumber"] = 1;
        dr["EmployeeNo"] = string.Empty;
        dr["DisplayName"] = string.Empty;
        dr["Department"] = string.Empty;
        dr["JobTitle"] = string.Empty;
        dr["Manager"] = string.Empty;
        dr["Name"] = string.Empty;
        dt.Rows.Add(dr);
        //dr = dt.NewRow();

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

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

然后我這樣聲明我的數據表

 SetInitialRow();
 DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
 DataRow drCurrentRow = null;

然后我遍歷活動數據記錄

for (int i = 0; i < MyVars.NoOfADRecords; i++)
{
    Label empNo = (Label)Gridview1.Rows[i].Cells[1].FindControl("EmployeeNo");
    Label displayName =(Label)Gridview1.Rows[i].Cells[2].FindControl("DisplayName");
    Label dept =(Label)Gridview1.Rows[i].Cells[3].FindControl("Department");
    Label jobTitle = (Label)Gridview1.Rows[i].Cells[1].FindControl("JobTitle");
    Label manager = (Label)Gridview1.Rows[i].Cells[2].FindControl("Manager");
    Label name = (Label)Gridview1.Rows[i].Cells[3].FindControl("Name");

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

    empNo.Text = MyVars.ADEmployeeID[i];
    displayName.Text = MyVars.ADName[i];
    dept.Text = MyVars.ADDepartment[i];
    jobTitle.Text = MyVars.ADJobtitle[i];
    manager.Text = MyVars.ADManager[i];
    name.Text = MyVars.ADName[i];

    dtCurrentTable.Rows[i]["EmployeeNo"] = empNo.Text;
    dtCurrentTable.Rows[i]["DisplayName"] = displayName.Text;
    dtCurrentTable.Rows[i]["Department"] = dept.Text;
    dtCurrentTable.Rows[i]["JobTitle"] = jobTitle.Text;
    dtCurrentTable.Rows[i]["Manager"] = manager.Text;
    dtCurrentTable.Rows[i]["Name"] = name.Text;

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

現在，如果我將i替換為0，它會在第一個循環上崩潰

(Label)Gridview1.Rows[0].Cells[1].FindControl("EmployeeNo");

它可以工作，但是盡管所有記錄都顯示沒有數據。 當我調試empNo.text等代碼時，它們都具有值，那么我在做什么錯呢？

Answer 1

您正在將空行添加到數據表中。 替換下面的代碼以將行添加到數據表中

    drCurrentRow["EmployeeNo"] = empNo.Text;
    drCurrentRow["DisplayName"] = displayName.Text;
    drCurrentRow["Department"] = dept.Text;
    drCurrentRow["JobTitle"] = jobTitle.Text;
    drCurrentRow["Manager"] = manager.Text;
    drCurrentRow["Name"] = name.Text;

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

代替你的代碼

    dtCurrentTable.Rows[i]["EmployeeNo"] = empNo.Text;
        dtCurrentTable.Rows[i]["DisplayName"] = displayName.Text;
        dtCurrentTable.Rows[i]["Department"] = dept.Text;
        dtCurrentTable.Rows[i]["JobTitle"] = jobTitle.Text;
        dtCurrentTable.Rows[i]["Manager"] = manager.Text;
        dtCurrentTable.Rows[i]["Name"] = name.Text;
dtCurrentTable.Rows.Add(drCurrentRow);
    ViewState["CurrentTable"] = dtCurrentTable;

Answer 2

您正在SetInitialRow方法中綁定數據SetInitialRow 。 當您綁定到那里時，它僅將一個空行添加到GridView。 您應該在循環之后進行數據綁定以獲取所有用戶...

其次，您嘗試在GridView中找到沒有控件的控件，然后將其MyVars.NoOfADRecords為Label ，從MyVars.NoOfADRecords設置Label文本並將其添加到DataTable中。 最好像下面的代碼片段一樣將值直接添加到DataTable中。

for (int i = 0; i < MyVars.NoOfADRecords; i++)
{
    drCurrentRow["EmployeeNo"] = MyVars.ADEmployeeID[i];
    drCurrentRow["DisplayName"] = MyVars.ADName[i];

    dtCurrentTable.Rows.Add(drCurrentRow);
}

Gridview1.DataSource = dtCurrentTable;
Gridview1.DataBind();
ViewState["CurrentTable"] = dtCurrentTable;

但是您想要擺脫很多不必要的代碼，只需執行以下操作：

Gridview1.DataSource = MyVars.NoOfADRecords;
Gridview1.DataBind();

<ItemTemplate>
    <%# Eval("EmployeeNo") %>
</ItemTemplate>

Answer 3

我認為您的問題可能僅僅是因為您過早調用GridView1.DataBind（）。 在將所有行添加到dtCurrentTable之后，嘗試最后調用GridView1.DataBind（）。