微信支付MD5签名算法C#版，ASCII码字典序排序0,A,B,a,b

/// <summary>
        /// 微信支付MD5签名算法，ASCII码字典序排序0,A,B,a,b /// </summary>
        /// <param name="InDict">待签名名键值对</param>
        /// <param name="TenPayV3_Key">用于签名的Key</param>
        /// <returns>MD5签名字符串</returns>
        public static string WePaySign(IDictionary<string, string> InDict, string TenPayV3_Key) { string[] arrKeys = InDict.Keys.ToArray(); Array.Sort(arrKeys, string.CompareOrdinal);  //参数名ASCII码从小到大排序；0,A,B,a,b;

            var StrA = new StringBuilder(); foreach (var key in arrKeys) { string value = InDict[key]; if (!String.IsNullOrEmpty(value)) //空值不参与签名
 { StrA.Append(key + "=") .Append(value + "&"); } } //foreach (var item in InDict.OrderBy(x => x.Key))//参数名字典序；0,A,a,B,b; //{ // if(!String.IsNullOrEmpty(item.Value)) //空值不参与签名 // { // StrA.Append(item.Key + "=") // .Append(item.Value + "&"); // } //}
 StrA.Append("key=" + TenPayV3_Key); //注：key为商户平台设置的密钥key
            return StrFormat.GetMd5Hash(StrA.ToString()).ToUpper(); }