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//------------------------------------------------------------------------------
// <copyright file="QueryStringParameter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Data;
/// <devdoc>
/// Represents a Parameter that gets its value from the application's QueryString parameters.
/// </devdoc>
[
DefaultProperty("QueryStringField"),
]
public class QueryStringParameter : Parameter {
/// <devdoc>
/// Creates an instance of the QueryStringParameter class.
/// </devdoc>
public QueryStringParameter() {
}
/// <devdoc>
/// Creates an instance of the QueryStringParameter class with the specified parameter name and QueryString field.
/// </devdoc>
public QueryStringParameter(string name, string queryStringField) : base(name) {
QueryStringField = queryStringField;
}
/// <devdoc>
/// Creates an instance of the QueryStringParameter class with the specified parameter name, database type,
/// and QueryString field.
/// </devdoc>
public QueryStringParameter(string name, DbType dbType, string queryStringField)
: base(name, dbType) {
QueryStringField = queryStringField;
}
/// <devdoc>
/// Creates an instance of the QueryStringParameter class with the specified parameter name, type, and QueryString field.
/// </devdoc>
public QueryStringParameter(string name, TypeCode type, string queryStringField) : base(name, type) {
QueryStringField = queryStringField;
}
/// <devdoc>
/// Used to clone a parameter.
/// </devdoc>
protected QueryStringParameter(QueryStringParameter original) : base(original) {
QueryStringField = original.QueryStringField;
ValidateInput = original.ValidateInput;
}
/// <devdoc>
/// The name of the QueryString parameter to get the value from.
/// </devdoc>
[
DefaultValue(""),
WebCategory("Parameter"),
WebSysDescription(SR.QueryStringParameter_QueryStringField),
]
public string QueryStringField {
get {
object o = ViewState["QueryStringField"];
if (o == null)
return String.Empty;
return (string)o;
}
set {
if (QueryStringField != value) {
ViewState["QueryStringField"] = value;
OnParameterChanged();
}
}
}
/// <devdoc>
/// Creates a new QueryStringParameter that is a copy of this QueryStringParameter.
/// </devdoc>
protected override Parameter Clone() {
return new QueryStringParameter(this);
}
/// <devdoc>
/// Returns the updated value of the parameter.
/// </devdoc>
protected internal override object Evaluate(HttpContext context, Control control) {
if (context == null || context.Request == null) {
return null;
}
NameValueCollection queryStringCollection = ValidateInput ? context.Request.QueryString : context.Request.Unvalidated.QueryString;
return queryStringCollection[QueryStringField];
}
/// <summary>
/// Determines whether the parameter's value is being validated or not.
/// </summary>
[
WebCategory("Behavior"),
WebSysDescription(SR.Parameter_ValidateInput),
DefaultValue(true)
]
public bool ValidateInput {
get {
object o = ViewState["ValidateInput"];
if (o == null)
return true;
return (bool)o;
}
set {
if (ValidateInput != value) {
ViewState["ValidateInput"] = value;
OnParameterChanged();
}
}
}
}
}
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