ICryptographyDecrypt 方法 (String)

针对Base64字符串进行解密操作，转为二进制数据后进行解密，解密之后使用UTF8编码获取最终的字符串数据
Decrypt the Base64 string, convert it to binary data, and decrypt it. After decryption, use UTF8 encoding to obtain the final string data.

string Decrypt(
	string data
)

Function Decrypt ( 
	data As String
) As String

String^ Decrypt(
	String^ data
)

abstract Decrypt : 
        data : string -> string