QueryStringParameter Constructor (String, TypeCode, String)
Assembly: System.Web (in system.web.dll)
public QueryStringParameter ( String name, TypeCode type, String queryStringField )
public function QueryStringParameter ( name : String, type : TypeCode, queryStringField : String )
Parameters
- name
The name of the parameter.
- type
The type that the parameter represents. The default is Object.
- queryStringField
The name of the query string field that the parameter object is bound to. The default is Empty.
A QueryStringParameter object created with the QueryStringParameter constructor is initialized with the specified parameter name, Type, and string that identifies the query string field that the parameter binds to. Only the Direction and ConvertEmptyStringToNull properties are initialized with default values.
The following code example demonstrates how to create a QueryStringParameter object with the QueryStringParameter constructor and add it to an AccessDataSource control's FilterParameters collection. A GridView control displays data only if the "employee" and "country" query string fields are passed on the query string with valid values.
<%@ Page language="VJ#"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<SCRIPT runat="server">
private void Page_Load(Object sender, System.EventArgs e)
{
QueryStringParameter countryFilter = new QueryStringParameter("country",
System.TypeCode.String, "country");
MyAccessDataSource.get_FilterParameters().Add(countryFilter);
} //Page_Load
</SCRIPT>
<HTML>
<body>
<form id="Form1" method="post" runat="server">
<!-- Use a Query String with country=USA -->
<asp:GridView
id ="GridView1"
runat="server"
DataSourceMode="DataSet"
DataSourceID="MyAccessDataSource" />
<asp:AccessDataSource
id="MyAccessDataSource"
runat="server"
DataFile="Northwind.mdb"
SelectCommand="SELECT EmployeeID, LastName, Address, PostalCode, Country FROM Employees"
FilterExpression="Country = '@country'">
</asp:AccessDataSource>
</form>
</body>
</HTML>
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.