gridView总结
-----------GridView绑定行号------------
<%#DataBinder.Eval(Container,"RowIndex") %>
1.GridView无代码分页排序
1.1.AllowSorting设为True，aspx代码中是AllowSorting="True"；
1.2..默认1页10条，如果要修改每页条数，修改PageSize即可，在aspx代码中是PageSize="12"。
1.3.默认的是单向排序的，右击GridView弹出“属性”，选择AllowSorting为True即可。
2.GridView选中，编辑，取消，删除
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
...{
GridView1.EditIndex = e.NewEditIndex;
bind();
}
//删除
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
...{
string sqlstr = "delete from 表 where id=''" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "''";
bind();
}
//更新
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
...{
sqlcon = new SqlConnection(strCon);
string sqlstr = "update 表 set 字段1=''"
+ ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim() + "'',字段2=''"
+ ((TextBox)(GridView1.Rows[e.RowIndex].Cells[2].Controls[0])).Text.ToString().Trim() + "'',字段3=''"
+ ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "'' where id=''"
+ GridView1.DataKeys[e.RowIndex].Value.ToString() + "''";
GridView1.EditIndex = -1;
bind();
}
//取消
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
...{
GridView1.EditIndex = -1;
bind();
}
//绑定
public void bind()
...{
GridView1.DataSource = myds;
GridView1.DataKeyNames = new string[] ...{ "id" };//主键
GridView1.DataBind();
}
3.GridView正反双向排序
public partial class Default3 : System.Web.UI.Page
...{
protected void Page_Load(object sender, EventArgs e)
...{
if (!IsPostBack)
...{
ViewState["SortOrder"] = "身份证号码";
ViewState["OrderDire"] = "ASC";
bind();
}
}
protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
...{
string sPage = e.SortExpression;
if (ViewState["SortOrder"].ToString() == sPage)
...{
if (ViewState["OrderDire"].ToString() == "Desc")
ViewState["OrderDire"] = "ASC";
else
ViewState["OrderDire"] = "Desc";
}
else
...{
ViewState["SortOrder"] = e.SortExpression;
}
bind();
}
public void bind()
...{
myda.Fill(myds, "飞狐工作室");
DataView view = myds.Tables["飞狐工作室"].DefaultView;
string sort = (string)ViewState["SortOrder"] + " " + (string)ViewState["OrderDire"];
view.Sort = sort;
GridView1.DataSource = view;
GridView1.DataBind();
}
}
4.GridView和下拉菜单DropDownList结合
protected void Page_Load(object sender, EventArgs e)
...{
DropDownList ddl;
if (!IsPostBack)
...{
string sqlstr = "select top 5 * from 飞狐工作室";
sqlcon = new SqlConnection(strCon);
SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
DataSet myds = new DataSet();
sqlcon.Open();
myda.Fill(myds, "飞狐工作室");
GridView1.DataSource = myds;
GridView1.DataBind();
for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
...{
DataRowView mydrv = myds.Tables["飞狐工作室"].DefaultView[i];
if (Convert.ToString(mydrv["员工性别"]).Trim() == "True")
...{
ddl = (DropDownList)GridView1.Rows[i].FindControl("DropDownList1");
ddl.SelectedIndex = 0;
}
if (Convert.ToString(mydrv["员工性别"]).Trim() == "False")
...{
ddl = (DropDownList)GridView1.Rows[i].FindControl("DropDownList1");
ddl.SelectedIndex = 1;
}
}
sqlcon.Close();
}
}
public SqlDataReader ddlbind()
...{
string sqlstr = "select distinct 员工性别 from 飞狐工作室";
sqlcon = new SqlConnection(strCon);
SqlCommand sqlcom = new SqlCommand(sqlstr, sqlcon);
sqlcon.Open();
return sqlcom.ExecuteReader();
}
5.GridView和CheckBox结合
//checkBox在外部
protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
...{
for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
...{
CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
if (CheckBox2.Checked == true)
...{
cbox.Checked = true;
}
else
...{
cbox.Checked = false;
}
}
}
//遍例删除
protected void Button2_Click(object sender, EventArgs e)
...{
for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
...{
CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
if (cbox.Checked == true)
...{
string id = GridView1.DataKeys[i].Value;
}
}
6.GridView实现删除时弹出确认对话框
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
...{
//如果是绑定数据行 ////当有编辑列时，避免出错，要加的RowState判断
if (e.Row.RowType == DataControlRowType.DataRow)
...{
if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)
...{
((LinkButton)e.Row.Cells[6].Controls[0]).Attributes.Add("onclick", "javascript:return confirm(''你确认要删除："" + e.Row.Cells[1].Text + ""吗?'')");
}
}
}
7.GridView实现自动编号
在后台的GridView1_RowDataBound()方法添加代码，最后代码如下所示：
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
...{
//如果是绑定数据行 //清清月儿http://blog.csdn.net/21aspnet
if (e.Row.RowType == DataControlRowType.DataRow)
...{
/**/////鼠标经过时，行背景色变
e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor=''#E6F5FA''");
/**/////鼠标移出时，行背景色变
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=''#FFFFFF''");
}
if (e.Row.RowIndex != -1)
...{
int id = e.Row.RowIndex + 1;
e.Row.Cells[0].Text = id.ToString();
}
}
注意这时最好把前台的第一列的表头该为“编号”，因为以前的第一列被“吃掉”了。
8.GridView实现自定义时间货币等字符串格式
解决方法：
在asp.net 2.0中，如果要在绑定列中显示比如日期格式等，如果用下面的方法是显示不了的
<asp :BoundField DataField="CreationDate"
DataFormatString="{0:M-dd-yyyy}"
HeaderText="CreationDate" />
主要是由于htmlencode属性默认设置为true,已防止XSS攻击，安全起见而用的，所以，可以有以下两种方法解决
1、
<asp :GridView ID="GridView1" runat="server">
<columns>
<asp :BoundField DataField="CreationDate"
DataFormatString="{0:M-dd-yyyy}"
HtmlEncode="false"
HeaderText="CreationDate" />
</columns>
</asp>
将htmlencode设置为false即可
2.另外的解决方法为，使用模版列
<asp :GridView ID="GridView3" runat="server" >
<columns>
<asp :TemplateField HeaderText="CreationDate" >
<edititemtemplate>
<asp :Label ID="Label1" runat="server"
Text=''<%# Eval("CreationDate", "{0:M-dd-yyyy}") %>''>
</asp>
</edititemtemplate>
<itemtemplate>
<asp :Label ID="Label1" runat="server"
Text=’<%# Bind("CreationDate", "{0:M-dd-yyyy}") %>''>
</asp>
</itemtemplate>
</asp>
</columns>
</asp>
附录-常用格式化公式：
...{0:C} 货币；
...{0:D4}由0填充的4个字符宽的字段中显示整数；
...{0:000.0}四舍五入小数点保留第几位有效数字；
...{0:N2}小数点保留2位有效数字；...{0:N2}% 小数点保留2位有效数字加百分号；
...{0:D}长日期；...{0:d}短日期；...{0:yy-MM-dd} 例如07-3-25；；...{0:yyyy-MM-dd} 例如2007-3-25
9 .GridView实现用“...”代替超长字符串
public void bind()
...{
GridView1.DataSource = myds;
GridView1.DataKeyNames = new string[] ...{ "身份证号码" };
GridView1.DataBind();
for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
...{
DataRowView mydrv;
string gIntro;
if (GridView1.PageIndex == 0)
...{
mydrv = myds.Tables[0].DefaultView[i];
gIntro = Convert.ToString(mydrv["家庭住址"]);
GridView1.Rows[i].Cells[3].Text = SubStr(gIntro, 2);
}
else
...{
mydrv = myds.Tables["飞狐工作室"].DefaultView[i + (5 * GridView1.PageIndex)];
gIntro = Convert.ToString(mydrv["家庭住址"]);
GridView1.Rows[i].Cells[3].Text = SubStr(gIntro, 2);
}
}
}
调用的方法：
public string SubStr(string sString, int nLeng)
...{
if (sString.Length <= nLeng)
...{
return sString;
}
string sNewStr = sString.Substring(0, nLeng);
sNewStr = sNewStr + "...";
return sNewStr;
}
10.GridView一般换行与强制换行
gridview里有一列绑定的数据很长，显示的时候在一行里面显示，页面拉得很宽。
原因是连续英文段为一个整体导致的，在RowDataBound中添加上了一句e.Row.Cells[2].Style.Add("word-break", "break-all")就可以。
如果要给所有的列增加此属性：
protected void Page_Load(object sender, EventArgs e)
...{
//正常换行
GridView1.Attributes.Add("style", "word-break:keep-all;word-wrap:normal");
//下面这行是自动换行
GridView1.Attributes.Add("style", "word-break:break-all;word-wrap:break-word");
if (!IsPostBack)
...{
bind();//调用数据绑定即可
}
}
总之：善用CSS的word-break:break-all;word-wrap:break-word属性即可，这个属性是通用的对于顽固的南换行问题都可以解决，不局限于GridView。
11.GridView显示隐藏某一列
双击CheckBox1，在CheckedChanged方法里写上代码，最后代码如下：
protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
...{
GridView1.Columns[3].Visible=! GridView1.Columns[3].Visible;
Response.Write("GridView1的第4列现在的显示隐藏状态是："+GridView1.Columns[3].Visible.ToString());
}
12.GridView弹出新页面/弹出新窗口
方案二：精确控制弹出窗口大小位置
<asp:HyperLinkColumn DataNavigateUrlField="EmployeeID" DataNavigateUrlFormatString="javascript:varwin=window.open(''detail.aspx?ID={0}'',null,''width=300,height=200'');window.Close();"
DataTextField="LastName" HeaderText="LastName"></asp:HyperLinkColumn>
使用的是结合javascript的window.open方法，关于window.open的参数网上有很多帖子，本站也有许多参考
13.GridView固定表头(不用javascript只用CSS，2行代码，很好用)
<head runat="server">
<title>GridView固定表头 清清月儿http://blog.csdn.net/21aspnet </title>
<style>
.Freezing
...{
position:relative ;
table-layout:fixed;
top:expression(this.offsetParent.scrollTop);
z-index: 10;
}
.Freezing th...{text-overflow:ellipsis;overflow:hidden;white-space: nowrap;padding:2px;}
</style>
</head>
...
<div style="overflow-y: scroll; height: 200px;width:300px" id="dvBody">
<HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" CssClass="Freezing"/>
</div>
用法：CSS设如上的样式，HeaderStyle加CssClass="Freezing，套住GridView的Div设置高度宽度 <div style="overflow-y: scroll; height: 200px;width:200px" >
14.GridView合并表头多重表头无错完美版（以合并3列3行举例）
//这里就是解决方案
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
...{
switch (e.Row.RowType)
...{
case DataControlRowType.Header:
//第一行表头
TableCellCollection tcHeader = e.Row.Cells;
tcHeader.Clear();
tcHeader.Add(new TableHeaderCell());
tcHeader[0].Attributes.Add("rowspan", "3"); //跨Row
tcHeader[0].Attributes.Add("bgcolor", "white");
tcHeader[0].Text = "";
tcHeader.Add(new TableHeaderCell());
//tcHeader[1].Attributes.Add("bgcolor", "Red");
tcHeader[1].Attributes.Add("colspan", "6"); //跨Column
tcHeader[1].Text = "全部信息</th></tr><tr>";
//第二行表头
tcHeader.Add(new TableHeaderCell());
tcHeader[2].Attributes.Add("bgcolor", "DarkSeaGreen");
tcHeader[2].Text = "身份证号码";
tcHeader.Add(new TableHeaderCell());
tcHeader[3].Attributes.Add("bgcolor", "LightSteelBlue");
tcHeader[3].Attributes.Add("colspan", "2");
tcHeader[3].Text = "基本信息";
tcHeader.Add(new TableHeaderCell());
tcHeader[4].Attributes.Add("bgcolor", "DarkSeaGreen");
tcHeader[4].Text = "福利";
tcHeader.Add(new TableHeaderCell());
tcHeader[5].Attributes.Add("bgcolor", "LightSteelBlue");
tcHeader[5].Attributes.Add("colspan", "2");
tcHeader[5].Text = "联系方式</th></tr><tr>";
//第三行表头
tcHeader.Add(new TableHeaderCell());
tcHeader[6].Attributes.Add("bgcolor", "Khaki");
tcHeader[6].Text = "身份证号码";
tcHeader.Add(new TableHeaderCell());
tcHeader[7].Attributes.Add("bgcolor", "Khaki");
tcHeader[7].Text = "姓名";
tcHeader.Add(new TableHeaderCell());
tcHeader[8].Attributes.Add("bgcolor", "Khaki");
tcHeader[8].Text = "出生日期";
tcHeader.Add(new TableHeaderCell());
tcHeader[9].Attributes.Add("bgcolor", "Khaki");
tcHeader[9].Text = "薪水";
tcHeader.Add(new TableHeaderCell());
tcHeader[10].Attributes.Add("bgcolor", "Khaki");
tcHeader[10].Text = "家庭住址";
tcHeader.Add(new TableHeaderCell());
tcHeader[11].Attributes.Add("bgcolor", "Khaki");
tcHeader[11].Text = "邮政编码";
break;
}
}
}
15.GridView突出显示某一单元格（例如金额低于多少，分数不及格等）
protected void bind()
...{
for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
...{
DataRowView mydrv = myds.Tables["飞狐工作室"].DefaultView[i];
string score = Convert.ToString(mydrv["起薪"]);
if (Convert.ToDouble(score) < 34297.00)//大家这里根据具体情况设置可能ToInt32等
...{
GridView1.Rows[i].Cells[4].BackColor = System.Drawing.Color.Red;
}
}
}
16.GridView加入自动求和求平均值小计(例如在购物车中，总计，平均)
private double sum = 0;//取指定列的数据和，你要根据具体情况对待可能你要处理的是int
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
...{
if (e.Row.RowIndex >= 0)
...{
//在第7列上运算
sum += Convert.ToDouble(e.Row.Cells[6].Text);
}
else if (e.Row.RowType == DataControlRowType.Footer)
...{
e.Row.Cells[5].Text = "总薪水为：";
e.Row.Cells[6].Text = sum.ToString();
e.Row.Cells[3].Text = "平均薪水为：";
e.Row.Cells[4].Text = ((int)(sum / GridView1.Rows.Count)).ToString();
}
}
17.GridView数据导入Excel/Excel数据读入GridView
解决方案：
页面增加一个按钮，单击事件添加如下方法：
protected void Button1_Click(object sender, EventArgs e)
...{
Export("application/ms-excel", "学生成绩报表.xls");
}
private void Export()
{
Response.Charset = "GB2312";
Response.ContentEncoding = System.Text.Encoding.UTF7;
Response.AppendHeader("Content-Disposition", "attachment;filename=" + DateTime.Now.ToString() + ".xls");
Response.ContentType = "application/ms-excel";
this.EnableViewState = false;
StringWriter tw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(tw);
GridView1.RenderControl(hw);
Response.Write(tw.ToString());
Response.End();
}
//如果没有下面方法会报错类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内
public override void VerifyRenderingInServerForm(Control control){}
还要设置该属性：EnableEventValidation="false"
只能在执行Render() 的过程中调用 RegisterForEventValidation；
只能在执行 Render() 的过程中调用 RegisterForEventValidation；
1、在Web.Config文件中：在<system.web></system.web>标记中添加如下代码：
<system.web>
<pages enableEventValidation="false"> </pages>
</system.web>
2、在具体的.aspx页面的源代码中修改代码，如下：
<%@ Page Language="C#" EnableEventValidation="false" AutoEventWireup="true" CodeFile="GridView_Export_Excel.aspx.cs" Inherits="GridView_Export_Excel" %>
还有由于是文件操作所以要引入名称空间IO和Text
读取Excel数据的代码：这个很简单的
private DataSet CreateDataSource()
...{
string strCon;
strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("excel.xls") + "; Extended Properties=Excel 8.0;";
OleDbConnection olecon = new OleDbConnection(strCon);
OleDbDataAdapter myda = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", strCon);
DataSet myds = new DataSet();
myda.Fill(myds);
return myds;
}
protected void Button1_Click(object sender, EventArgs e)
...{
GridView1.DataSource = CreateDataSource();
GridView1.DataBind();
}
18.鼠标移到GridView某一行时改变该行的背景色方法一
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
...{
int i;
//执行循环，保证每条数据都可以更新
for (i = 0; i < GridView1.Rows.Count; i++)
...{
//首先判断是否是数据行
if (e.Row.RowType == DataControlRowType.DataRow)
...{
//当鼠标停留时更改背景色
e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor=''#00A9FF''");
//当鼠标移开时还原背景色
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
}
}
}
鼠标移到GridView某一行时改变该行的背景色方法二
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
...{
/**/////执行循环，保证每条数据都可以更新
//for (int i = 0; i < GridView1.Rows.Count; i++)
//{
// //首先判断是否是数据行
// if (e.Row.RowType == DataControlRowType.DataRow)
// {
// //当鼠标停留时更改背景色
// e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor=''#00A9FF''");
// //当鼠标移开时还原背景色
// e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
// }
//}
//如果是绑定数据行
if (e.Row.RowType == DataControlRowType.DataRow)
...{
//鼠标经过时，行背景色变
e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor=''#E6F5FA''");
//鼠标移出时，行背景色变
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=''#FFFFFF''");
}
}
文章出处：http://www.diybl.com/course/4_webprogram/asp.net/asp_netxl/20071222/93080.html
