天猫登录源码 POST C# (3)

PostParaPair类的定义
public class PostParaPair
{
    List<PostParaPair> paraList = new List<PostParaPair>();
    public string Key { get; set; }
    public string Value { get; set; }
    public void Add(PostParaPair para)
    {
        paraList.Add(para);
    }
    public override string ToString()
    {
        string reString = "";
        if (paraList.Count != 0)
        {
            foreach (PostParaPair item in paraList)
            {
                reString += string.Format("&{0}={1}", item.Key, CommonMethod.GetUrlEncode(item.Value));
            }
        }
        return reString.TrimStart(\'&\');
    }
}

CommonMethod.GetUrlEncode的定义：

public static string GetUrlEncode(string content)
    {
        return System.Web.HttpUtility.UrlEncode(content, System.Text.Encoding.UTF8);
    }