C#将URL中的参数转换成字典Dictionary<string, string>

/// <summary>
/// 将获取的formData存入字典数组
/// </summary>
public static Dictionary<String, String> GetFormData(string formData)
{
try
{
//将参数存入字符数组
String[] dataArry = formData.Split('&');

//定义字典,将参数按照键值对存入字典中
Dictionary<String, String> dataDic = new Dictionary<string, string>();
//遍历字符数组
for (int i = 0; i <= dataArry.Length - 1; i++)
{
//当前参数值
String dataParm = dataArry[i];
//"="的索引值
int dIndex = dataParm.IndexOf("=");
//参数名作为key
String key = dataParm.Substring(0, dIndex);
//参数值作为Value
String value = dataParm.Substring(dIndex + 1, dataParm.Length - dIndex - 1);
//将编码后的Value解码
String deValue = System.Web.HttpUtility.UrlDecode(value, System.Text.Encoding.GetEncoding("utf-8"));
if (key != "__VIEWSTATE")
{
//将参数以键值对存入字典
dataDic.Add(key, deValue);
}
}

return dataDic;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}