1.打开开始菜单
2.选择程序中的Microsoft .NET FrameWork
3.选择Documention
4.选择Index选项卡
5.输入“DataFormatString property”
6.双出出现的第一个关键词。
7.以下出现内容：
.NET Framework Class Library
BoundColumn.DataFormatString PropertySee Also
BoundColumn Class | BoundColumn Members | System.Web.UI.WebControls Namespace | String.Empty | DataGrid | Formatting Overview
Requirements
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP
Language
C#
C++
JScript
Visual Basic
Show All
This is preliminary documentation and subject to change.
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Gets or sets the string that specifies the display format for items in the column.
[Visual Basic]
Overridable Public Property DataFormatString As String
[C#]
public virtual string DataFormatString {get; set;}
[C++]
public: __property virtual String* get_DataFormatString();
public: __property virtual void set_DataFormatString(String*);
[JScript]
public function get DataFormatString() : String;
public function set DataFormatString(String);
Property Value
A formatting string that specifies the display format of items in the column. The default value is String.Empty.
Remarks
Use the DataFormatString property to provide a custom format for the items in the column.
The data format string consists of two parts, separated by a colon, in the form {A:Bxx}. For example, the formatting string, {0:D2}, would format the cell to display a number with two decimal places.
Note The entire string must be enclosed in curly braces to denote that it is a format string and not a literal string. Any text outside the curly braces is displayed as literal text.
The value before the colon ( A in the general example) specifies the parameter index in a zero-based list of parameters.
Note This value can only be set to 0 because there is only one value in each cell.
The character after the colon ( B in the general example) specifies the format to display the value in. The following table lists the common formats.
Format Character Description
C Displays numeric values in currency format.
D Displays numeric values in decimal format.
E Displays numeric values in scientific (exponential) format.
F Displays numeric values in fixed format.
G Displays numeric values in general format.
N Displays numeric values in number format.
X Displays numeric values in hexadecimal format.
Note The format character is not case-sensitive, except for X, which displays the hexadecimal characters in the case specified.
The value after the format character ( xx in the general example) specifies the number of significant digits or decimal places to display the value in.
For more information on formatting strings, see Formatting Overview.
Example
[Visual Basic, C#] The following example demonstrates how to use the DataFormatString property to specify currency format for the column that displays the prices in of the DataGrid control.
[C#]
<%@ Import Namespace="System.Data" %>
<html>
<script language="C#" runat="server">
ICollection CreateDataSource()
{
DataTable dt = new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));
for (int i = 0; i < 9; i++)
{
dr = dt.NewRow();
dr[0] = i;
dr[1] = "Item " + i.ToString();
dr[2] = 1.23 * (i + 1);
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;
}
void Page_Load(Object sender, EventArgs e)
{
if (!IsPostBack)
{
// need to load this data only once
ItemsGrid.DataSource= CreateDataSource();
ItemsGrid.DataBind();
}
}
</script>
<body>
<form runat=server>
<h3><font face="Verdana">BoundColumn Example</font></h3>
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
AutoGenerateColumns="false"
runat="server">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<Columns>
<asp:BoundColumn
HeaderText="Number"
DataField="IntegerValue">
</asp:BoundColumn>
<asp:BoundColumn
HeaderText="Description"
DataField="StringValue">
</asp:BoundColumn>
<asp:BoundColumn
HeaderText="Price"
DataField="CurrencyValue"
DataFormatString="{0:c}">
</asp:BoundColumn>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>
[Visual Basic]
<%@ Import Namespace="System.Data" %>
<html>
<script language="VB" runat="server">
Function CreateDataSource() As ICollection
Dim dt As New DataTable()
Dim dr As DataRow
dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
Dim i As Integer
For i = 0 To 8
dr = dt.NewRow()
dr(0) = i
dr(1) = "Item " + i.ToString()
dr(2) = 1.23 *(i + 1)
dt.Rows.Add(dr)
Next i
Dim dv As New DataView(dt)
Return dv
End Function 'CreateDataSource
Sub Page_Load(sender As Object, e As EventArgs)
If Not IsPostBack Then
' need to load this data only once
ItemsGrid.DataSource = CreateDataSource()
ItemsGrid.DataBind()
End If
End Sub 'Page_Load
</script>
<body>
<form runat=server>
<h3><font face="Verdana">BoundColumn Example</font></h3>
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
AutoGenerateColumns="false"
runat="server">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<Columns>
<asp:BoundColumn
HeaderText="Number"
DataField="IntegerValue">
</asp:BoundColumn>
<asp:BoundColumn
HeaderText="Description"
DataField="StringValue">
</asp:BoundColumn>
<asp:BoundColumn
HeaderText="Price"
DataField="CurrencyValue"
DataFormatString="{0:c}">
</asp:BoundColumn>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>
[C++, JScript] No example is available in C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button in the upper-left corner of the page.
Requirements
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP
See Also
BoundColumn Class | BoundColumn Members | System.Web.UI.WebControls Namespace | String.Empty | DataGrid | Formatting Overview