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答案：在asp.net 2.0中，gridview控件是十分不错的控件。有的时候，可能一个GRIDVIEW控件中
的各行都是文本框，如何一次性更新所有修改过的记录呢？有两种方法，一种是使用sqldatasource来更新
所有记录，但这个方法比较慢，因为每更新一条记录都要建立数据连接并执行updatecommand,会影响性能，
但还是先来看下实现方法：
<%@ Page Language="C#" %>
<script runat="server">
void Button1_Click(object sender, EventArgs e)
{
for (int i = 0; i < GridView1.Rows.Count; i++)
{
GridViewRow row = GridView1.Rows[i];
SqlDataSource1.UpdateParameters[0].DefaultValue = ((TextBox)row.Cells[0].FindControl("TextBox2")).Text;
SqlDataSource1.UpdateParameters[1].DefaultValue = ((TextBox)row.Cells[1].FindControl("TextBox3")).Text;
SqlDataSource1.UpdateParameters[2].DefaultValue = GridView1.DataKeys[i].Value.ToString();
SqlDataSource1.Update();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" Runat="server" DataSourceID="SqlDataSource1" DataKeyNames="CustomerID"
AutoGenerateColumns="False">
<Columns>
<asp:TemplateField SortExpression="CustomerID" HeaderText="CustomerID">
<ItemTemplate>
<asp:TextBox Runat="server" Text='<%# Bind("CustomerID") %>' ID="TextBox1"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField SortExpression="CompanyName" HeaderText="CompanyName">
<ItemTemplate>
<asp:TextBox Runat="server" Text='<%# Bind("CompanyName") %>' ID="TextBox2"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField SortExpression="ContactName" HeaderText="ContactTitle">
<ItemTemplate>
<asp:TextBox Runat="server" Text='<%# Bind("ContactTitle") %>' ID="TextBox3"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" Runat="server"
SelectCommand="SELECT [CustomerID], [CompanyName], [ContactName], [ContactTitle] FROM [Customers]"
UpdateCommand="UPDATE [Customers] SET [CompanyName] = @CompanyName, [ContactTitle] = @ContactTitle WHERE [CustomerID] = @CustomerID"
ConnectionString="<%$ ConnectionStrings:AppConnectionString1 %>">
<UpdateParameters>
<asp:Parameter Type="String" Name="CompanyName"></asp:Parameter>
<asp:Parameter Type="String" Name="ContactTitle"></asp:Parameter>
<asp:Parameter Type="String" Name="CustomerID"></asp:Parameter>
</UpdateParameters>
</asp:SqlDataSource>
<asp:Button ID="Button1" Runat="server" Text="Button" OnClick="Button1_Click" />
</div>
</form>
</body>
</html>
另外一个方法是用组合SQL语句来进行的，速度比较快，原理也容易明白
<%@ Page Language="C#" %>
<%@ Import Namespace="System.Text" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<script runat="server">
void Button1_Click(object sender, EventArgs e)
{
StringBuilder query = new StringBuilder();
for (int i = 0; i < GridView1.Rows.Count; i++)
{
GridViewRow row = GridView1.Rows[i];
string value1 = ((TextBox)row.Cells[0].FindControl("TextBox2")).Text.Replace("'","''");
string value2 = ((TextBox)row.Cells[1].FindControl("TextBox3")).Text.Replace("'","''");
string value3 = GridView1.DataKeys[i].Value.ToString();
query.Append("UPDATE [Customers] SET [CompanyName] = '")
.Append(value1).Append("' , [ContactTitle] = '")
.Append(value2).Append("' WHERE [CustomerID] = '")
.Append(value3).Append("';\n");
}
SqlConnection con = new SqlConnection(ConfigurationSettings.ConnectionStrings["AppConnectionString1"].ConnectionString);
SqlCommand command = new SqlCommand(query.ToString(), con);
con.Open();
command.ExecuteNonQuery();
con.Close();
}
void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
SqlConnection con = new SqlConnection(ConfigurationSettings.ConnectionStrings["AppConnectionString1"].ConnectionString);
SqlCommand command = new SqlCommand("SELECT [CustomerID], [CompanyName], [ContactName], [ContactTitle] FROM [Customers]", con);
con.Open();
GridView1.DataSource = command.ExecuteReader();
GridView1.DataBind();
con.Close();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" Runat="server" DataKeyNames="CustomerID"
AutoGenerateColumns="False">
<Columns>
<asp:TemplateField SortExpression="CustomerID" HeaderText="CustomerID">
<ItemTemplate>
<asp:TextBox Runat="server" Text='<%# Bind("CustomerID") %>' ID="TextBox1"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField SortExpression="CompanyName" HeaderText="CompanyName">
<ItemTemplate>
<asp:TextBox Runat="server" Text='<%# Bind("CompanyName") %>' ID="TextBox2"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
