终于搞定微信验证拉！微信的验证sha1是php算出来的，要转成net算的

public static string SHA1Sign(string data)

{

byte[] temp1 = Encoding.UTF8.GetBytes(data);

SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider();

byte[] temp2 = sha.ComputeHash(temp1);

sha.Clear();

// 注意， 不能用这个

//string output = Convert.ToBase64String(temp2);

string output = BitConverter.ToString(temp2);

output = output.Replace("-", "");

output = output.ToLower();

return output;

}