QueryStringParameter.QueryStringParameter(String, TypeCode, String) Constructor
Assembly: System.Web (in system.web.dll)
public QueryStringParameter ( String name, TypeCode type, String queryStringField )
public function QueryStringParameter ( name : String, type : TypeCode, queryStringField : String )
Not applicable.
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 xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET Example</title>
</head>
<body>
<form id="Form1" method="post" runat="server">
<!-- Use a Query String with country=USA -->
<asp:GridView
id ="GridView1"
runat="server"
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>