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GridView从入门到精

工作中常常用到数据绑定，而使用GridView的次数最多，现在把GridView的一些常用方法写下来。

新建一个asps的页面。如下

View Code

<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" /><br/>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
           >
            <Columns>
            <asp:TemplateField >
            <HeaderTemplate>
                                         <asp:CheckBox runat="server" Text="选择" ID="checkall" TextAlign="Left" AutoPostBack="true"  OnCheckedChanged="CheckAll" />
            </HeaderTemplate>
              <ItemTemplate >
              <asp:CheckBox id="danxuan" runat="server"  />
               </ItemTemplate>
            </asp:TemplateField>
                <asp:BoundField DataField="OrderId" />
                 <asp:HyperLinkField DataTextField="OrderId" HeaderText="IP地址" DataNavigateUrlFormatString="WebForm1.aspx?HangBiaoShi={0}"
                                                DataNavigateUrlFields="OrderId" 
                    HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center"
                                                Target="_blank" >
<HeaderStyle HorizontalAlign="Center"></HeaderStyle>

<ItemStyle HorizontalAlign="Center"></ItemStyle>
                </asp:HyperLinkField>
                <asp:BoundField DataField="OrderDate" HeaderText="日期" />
                <asp:BoundField DataField="userid" HeaderText="文件编号" />
                <asp:BoundField DataField="totalprice" HeaderText="单价" />
                <asp:BoundField DataField="postaddress" HeaderText="地址" />
                <asp:BoundField DataField="state" HeaderText="单" />
                
            </Columns>
        </asp:GridView>
    </div>
    <div>
        <asp:Button ID="Button2" runat="server" Text="Button" onclick="Button2_Click" /> 
    </div>
    </form>
</body>

后台绑定数据如下

 string conn = "Data Source=.;Initial Catalog=bookshop;User ID=sa;Password=123456";
        protected void Button1_Click(object sender, EventArgs e)
        {
            using (SqlConnection coonn = new SqlConnection(conn))
            {
                string sql = "select * from orders";

                using (SqlCommand cmd = new SqlCommand(sql, coonn))
                {
                    SqlDataAdapter sd = new SqlDataAdapter(cmd);

                    DataTable tb = new DataTable();
                    sd.Fill(tb);

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

连接数据库，查询一个表，绑定到GridView上

第一个功能，全选和全不选，这个常用到，在GridView里面回一个头模板，在头模板里面放一个CheckBox,写一个oncheckedchanged事件

</HeaderTemplate>

然后在加一个项模板在项模板中新增一个Checkbox,

记住在最外面还要加一个 <asp:TemplateField ItemStyle-HorizontalAlign="Center">模板。

现在写Checkbox单选事件的后台代码

  protected void CheckAll(object sender, EventArgs e)
        {
            CheckBox cb;
         

            if (((CheckBox)sender).Checked == false)
            {
                for (int i = 0; i < GridView1.Rows.Count; i++)
                {
                    cb = (CheckBox)GridView1.Rows[i].Cells[0].FindControl("danxuan");
                    cb.Checked = false;
                }
            }
            if (((CheckBox)sender).Checked == true)
            {
                
                for (int i = 0; i < GridView1 .Rows.Count; i++)
                {
                    cb = (CheckBox)GridView1.Rows[i].Cells[0].FindControl("danxuan");
                    cb.Checked = true;
                }
            }
                
        }

这样全选和全不选就做好了，

二现在再做一个超连接

把其中一列改为

<asp:HyperLinkField DataTextField="OrderId" HeaderText="IP地址" DataNavigateUrlFormatString="WebForm1.aspx?HangBiaoShi={0}"
DataNavigateUrlFields="OrderId"
HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center"
Target="_self" >
<HeaderStyle HorizontalAlign="Center"></HeaderStyle>

绑定字段是Orderid,DataNavigateUrlFormatString是超连接的地址，后面的参数是“DataNavigateUrlFields="OrderId”，这样我们点这一列就会定向到一个新的页面还会加一个参数。

当选中一列的时候，单机一个按键，得到这一列一个字段的值。

 protected void Button2_Click(object sender, EventArgs e)
        {
            CheckBox cb;
            for (int i = 0; i <GridView1 .Rows.Count; i++)
            {
                 cb = (CheckBox)GridView1.Rows[i].Cells[0].FindControl("danxuan");

                 if (cb.Checked == true)
                 {
                  
                     string ss = GridView1.Rows[i].Cells[1].Text;

                     Response.Write(ss.ToString());
                 }
            }
        }

三，设置GridView的DataKeyNames属性，在这个属性里面，可以把我们后台绑定在GridView的字单全放在这个属性里面，用,号分开，可以放多个字单值，如：DataKeyNames="prizename,number,totalpointm,prizeid,

然后我们在后台如何使用呢？看下面：

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{

//这行代码就可以得到我们当前在保存在页面DataKeyNames属性里的字单的值！而且它还会自动找到当前行的值，很不错哦！
String lsHBaseInfoId = GridView1.SelectedDataKey.Values["prizename"].ToString();

String id = GridView1.SelectedDataKey.Values["number"].ToString();

Response.Write(lsHBaseInfoId);
}

GridView1_SelectedIndexChanged这个事件的意思是：当你选择行时，对这行操作时发生，比如我们在GridView里面加了一个

<asp:CommandField SelectText="处理" HeaderText="操作" ShowSelectButton="True"/> 列，当我们在页面点击这列的时候就会

进入到这个方法！

---------------------------------------------------------------------

从GridView里面导出EXCEL文件：

#region 导出到EXCEL按钮事件
protected void btnToExcel_Click(object sender, EventArgs e)
{

if (GridView1.Rows.Count <= 0) return;

  Response.Charset = "GB2312";
  Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
  GridView1.AllowPaging = false;
  GridView1.AllowSorting = false;
  GridView1.Page.EnableViewState = false;

Response.AddHeader("content-disposition", "attachment; filename=" + HttpUtility.UrlEncode("酒店佣金对账调整表" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls", System.Text.Encoding.UTF8));

  Response.ContentType = "application/ms-excel";
  Response.Write("<meta http-equiv=Content-Type content=\"text/html; charset=GB2312\">");

this.GridView1.DataSource = GetDataList(); //绑定GridView
this.GridView1.DataBind();

  System.IO.StringWriter tw = new System.IO.StringWriter();
  HtmlTextWriter hw = new HtmlTextWriter(tw);
  GridView1.RenderControl(hw);
  Response.Write(tw.ToString());
  GridView1.AllowPaging = true;
  Response.End();

}
#endregion

一定要重写这个方法，不然会报错！

public override void VerifyRenderingInServerForm(Control control)
{

}
这样简单就可以实现把GridView转成EXCEL输出了！就这么简单！

//gvw 需要合并的GridView，sCol要合并开始列（从0开始），eCol要合并的结束列

public static void MergeRows(GridView gvw, int sCol, int eCol)
{
for (int rowIndex = gvw.Rows.Count - 2; rowIndex >= 0; rowIndex--)
{
GridViewRow row = gvw.Rows[rowIndex];

GridViewRow previousRow = gvw.Rows[rowIndex + 1];

for (int i = sCol; i < eCol + 1; i++)
{
if (row.Cells[i].Text != "" && row.Cells[i].Text != " ")
{
if (row.Cells[i].Text == previousRow.Cells[i].Text)
{
row.Cells[i].RowSpan = previousRow.Cells[i].RowSpan < 1 ? 2 : previousRow.Cells[i].RowSpan + 1;

previousRow.Cells[i].Visible = false;
}
}
}
}
}

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
GridViewRow GridR = GridView1.SelectedRow;
string S = GridR.Cells[1].Text.ToString();
Response.Write(S);
}

今天先写到这，过几天有时间再加一些别的用方法

 http://www.360doc.com/content/12/0904/10/1039473_234182842.shtml

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原文地址：https://www.cnblogs.com/xu3593/p/3003231.html