如何在数据源是空的时候，gridview显示表头（万能）

一般我们用gridview 绑定数据的时候，当数据源是空的时候，通常是写：EmptyDataText="没有任何数据可以显示"，这样的话表头是不显示的，下面的代码实现当数据源是空的时候，我们不仅显示表头，而且显示：没有任何数据可以显示，图片在最下面：

注意：一定要要设

EmptyDataText="没有任何数据可以显示"；然后在.cs文件里面bind()方法里面绑定数据源之后（this.GVpositionrecods.DataBind()）之后，把对应的代码复制过去，就OK了。

下面是代码：

.aspx

代码

<head runat="server">
    <title>职位申请记录</title>
    <link rel="stylesheet" href="css/common.css" type="text/css" />
    <style type="text/css">                  .cssPager span {  color:blue;}             </style>
</head>
<body>
    <form id="form1" runat="server">
        <div id="man_zone">
            <center>
                <asp:GridView  AllowSorting="True" ID="GVpositionrecods" runat="server" PageSize="12" AllowPaging="True"
                    EmptyDataText="没有任何数据可以显示" Width="99%" AutoGenerateColumns="False" OnRowDataBound="GVpositionrecods_RowDataBound"
                    OnSelectedIndexChanged="GVpositionrecods_SelectedIndexChanged" OnSelectedIndexChanging="GVpositionrecods_SelectedIndexChanging"
                    OnPageIndexChanging="GVpositionrecods_PageIndexChanging" OnRowCreated="GVpositionrecods_RowCreated" OnSorting="GVpositionrecods_Sorting">
                    <Columns>
                        <asp:TemplateField HeaderText="职位" SortExpression="zhiwei">
                            <ItemTemplate>
                                <a href='throwseeen2.aspx?qiyeid=<%#Eval("qiyeid")%>&id=<%#Eval("ORDER_FORM_ID") %>'>
                                    <%#Eval("zhiwei") %>
                                </a>
                            </ItemTemplate>
                            <ItemStyle HorizontalAlign="Center" />
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="企业名称" SortExpression="qiyeid">
                            <ItemTemplate>
                                <a href='seeenlist.aspx?getidforen=<%#Eval("qiyeid")%>'>
                                    <%#Eval("qiye")%>
                                </a>
                            </ItemTemplate>
                            <ItemStyle HorizontalAlign="Center" />
                        </asp:TemplateField>
                        <asp:BoundField DataField="COUNT" HeaderText="人数" SortExpression="COUNT">
                            <ItemStyle HorizontalAlign="Center" />
                        </asp:BoundField>
                        <asp:BoundField DataField="STAR_TIME"  SortExpression="STAR_TIME"  HeaderText="发布时间" DataFormatString="{0:yyyy-MM-dd}"
                            HtmlEncode="False">
                            <ItemStyle HorizontalAlign="Center" />
                        </asp:BoundField>
                        <asp:BoundField DataField="END_TIME" SortExpression="END_TIME" HeaderText="结束时间" DataFormatString="{0:yyyy-MM-dd}"
                            HtmlEncode="False">
                            <ItemStyle HorizontalAlign="Center" />
                        </asp:BoundField>
                        <asp:BoundField DataField="flag" HeaderText="状态">
                            <ItemStyle HorizontalAlign="Center" />
                        </asp:BoundField>
                    </Columns>
                    <AlternatingRowStyle BackColor="#E2F8FF"></AlternatingRowStyle>
                    <HeaderStyle HorizontalAlign="Center" BackColor="#99CCFF"></HeaderStyle>
                <PagerStyle CssClass="cssPager" />
                </asp:GridView>
                <asp:Label ID="lbcontent" runat="server"></asp:Label>
            </center>
        </div>
    </form>
</body>

.cs

代码

public void bind()
    {
        //得到对应的简历的ID，从SN里面查看值
        ccwu.Model.T_RESUME_INFO listTemp = (ccwu.Model.T_RESUME_INFO)Session["t_resume_info"];
        ccwu.Model.T_ORDER_RESUME torderresume = new ccwu.Model.T_ORDER_RESUME();
        int id = Convert.ToInt32(listTemp.ID.ToString());
        //得到对应的简历的ID，从SN里面查看值

        ccwu.DAL.T_JOB jobdal = new ccwu.DAL.T_JOB();
        string where = "RESUME_INFO_ID='" + id.ToString() + "'";

        DataSet ds = jobdal.getlistResume(where);

        DataView dv = new DataView(ds.Tables[0]);

        dv.Sort = ViewState["sortExp"].ToString() + " " + ViewState["sortDir"].ToString();

        GVpositionrecods.DataSource = dv;

        this.GVpositionrecods.DataBind();

        if (this.GVpositionrecods.Rows.Count > 0)
        {

        }
        else//如果数据源是空的
        {
            //表头的设置
            GridViewRow row = new GridViewRow(-1, -1, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);
            foreach (DataControlField field in this.GVpositionrecods.Columns)
            {
                TableCell cell = new TableCell();
                cell.Text = field.HeaderText;
                cell.Width = field.HeaderStyle.Width;
                cell.Height = field.HeaderStyle.Height;
                cell.ForeColor = field.HeaderStyle.ForeColor;
                cell.Font.Size = field.HeaderStyle.Font.Size;
                cell.Font.Bold = field.HeaderStyle.Font.Bold;
                cell.Font.Name = field.HeaderStyle.Font.Name;
                cell.Font.Strikeout = field.HeaderStyle.Font.Strikeout;
                cell.Font.Underline = field.HeaderStyle.Font.Underline;
                cell.BackColor = field.HeaderStyle.BackColor;
                cell.VerticalAlign = field.HeaderStyle.VerticalAlign;
                cell.HorizontalAlign = field.HeaderStyle.HorizontalAlign;
                cell.CssClass = field.HeaderStyle.CssClass;
                cell.BorderColor = field.HeaderStyle.BorderColor;
                cell.BorderStyle = field.HeaderStyle.BorderStyle;
                cell.BorderWidth = field.HeaderStyle.BorderWidth;
                row.Cells.Add(cell);
            }
            TableItemStyle headStyle = this.GVpositionrecods.HeaderStyle;
            TableItemStyle emptyStyle = GVpositionrecods.EmptyDataRowStyle;
            emptyStyle.Width = headStyle.Width;
            emptyStyle.Height = headStyle.Height;
            emptyStyle.ForeColor = headStyle.ForeColor;
            emptyStyle.Font.Size = headStyle.Font.Size;
            emptyStyle.Font.Bold = headStyle.Font.Bold;
            emptyStyle.Font.Name = headStyle.Font.Name;
            emptyStyle.Font.Strikeout = headStyle.Font.Strikeout;
            emptyStyle.Font.Underline = headStyle.Font.Underline;
            emptyStyle.BackColor = headStyle.BackColor;
            emptyStyle.VerticalAlign = headStyle.VerticalAlign;
            emptyStyle.HorizontalAlign = headStyle.HorizontalAlign;
            emptyStyle.CssClass = headStyle.CssClass;
            emptyStyle.BorderColor = headStyle.BorderColor;
            emptyStyle.BorderStyle = headStyle.BorderStyle;
            emptyStyle.BorderWidth = headStyle.BorderWidth;
            //空白行的设置
            GridViewRow row1 = new GridViewRow(0, -1, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);

                TableCell cell1 = new TableCell();

                cell1.Text = "没有任何数据可以显示";
                cell1.BackColor = System.Drawing.Color.White;
                row1.Cells.Add(cell1);
                cell1.ColumnSpan = 6;


            if (this.GVpositionrecods.Controls.Count == 0)
            {
                GVpositionrecods.Page.Response.Write("<script language='javascript'>alert('必须在初始化表格类之前执行DataBind方法并设置EmptyDataText属性不为空!');</script>");
            }
            else
            {
                GVpositionrecods.Controls[0].Controls.Clear();
                this.GVpositionrecods.Controls[0].Controls.AddAt(0, row);
                this.GVpositionrecods.Controls[0].Controls.AddAt(1, row1);
            }
        }

    }

知识点1：

GridViewRow和DataRowView完全就是两个不相干的东西 是两个级别的事情 一个是控件级别的 一个是数据级别的

GridViewRow：

MSDN解释：呈现 GridView 控件之前，必须先为该控件中的每一行创建一个 GridViewRow 对象。在创建 GridView 控件中的每一行时，将引发 RowCreated 事件。这使您可以提供一个这样的事件处理方法，即每次发生此事件时就执行一个自定义例程（如在行中添加自定义内容）。

使用 RowCreated 事件将正在创建的行的索引存储在该行所包含 LinkButton 控件的 CommandArgument 属性中；(每当创建一行的时候，执行RowCreated事件里面的代码)

知识点2：(在有页码的时候，当前页码变大，且颜色也变)

用样式显示当前页码；

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原文地址：https://www.cnblogs.com/muer/p/1697178.html