恐怕我不知道有任何内置方法,我们使用这种方法来获取查询字符串并设置参数
/// <summary>
/// Set a parameter value in a query string. If the parameter is not found in the passed in query string,
/// it is added to the end of the query string
/// </summary>
/// <param name="queryString">The query string that is to be manipulated</param>
/// <param name="paramName">The name of the parameter</param>
/// <param name="paramValue">The value that the parameter is to be set to</param>
/// <returns>The query string with the parameter set to the new value.</returns>
public static string SetParameter(string queryString, string paramName, object paramValue)
{
//create the regex
//match paramname=*
//string regex = String.Format(@"{0}=[^&]*", paramName);
string regex = @"([&?]{0,1})" + String.Format(@"({0}=[^&]*)", paramName);
RegexOptions options = RegexOptions.RightToLeft;
// Querystring has parameters...
if (Regex.IsMatch(queryString, regex, options))
{
queryString = Regex.Replace(queryString, regex, String.Format("$1{0}={1}", paramName, paramValue));
}
else
{
// If no querystring just return the Parameter Key/Value
if (queryString == String.Empty)
{
return String.Format("{0}={1}", paramName, paramValue);
}
else
{
// Append the new parameter key/value to the end of querystring
queryString = String.Format("{0}&{1}={2}", queryString, paramName, paramValue);
}
}
return queryString;
}
显然,您可以使用NameValueCollection
URI 对象的 QueryString 属性来更轻松地查找值,但我们希望能够解析任何查询字符串。