c#获取url中的查询字符串参数

/// <summary>
/// 获取url中的查询字符串参数
/// </summary>
public static NameValueCollection ExtractQueryParams(string url)
{
int startIndex = url.IndexOf("?");
NameValueCollection values = new NameValueCollection();

if (startIndex <= 0)
return values;

string[] nameValues = url.Substring(startIndex + 1).Split('&');

foreach (string s in nameValues)
{
string[] pair = s.Split('=');

string name = pair[0];
string value = string.Empty;

if (pair.Length > 1)
value = pair[1];

values.Add(name, value);
}

return values;
}