编译器错误消息：CS0103：当前上下文中不存在名称“ProtectedData”

Question

I am getting a runtime error when trying to use System.Security's crypto code. I added a reference to System.Security and everything looks good but I am getting this error: "Compiler Error Message: CS0103: The name 'ProtectedData' does not exist in the current context"

here is the code that is throwing the error.

public static string EncryptString(SecureString input, string entropy)
    {
        byte[] salt = Encoding.Unicode.GetBytes(entropy);
        byte[] encryptedData = ProtectedData.Protect(
            Encoding.Unicode.GetBytes(ToInsecureString(input)),
            salt,
            DataProtectionScope.CurrentUser);
        return Convert.ToBase64String(encryptedData);
    }

Thanks, Sam

Answer 1

You need to add a using statement for System.Security.Cryptography and you need a reference to System.Security.dll . From your question it appears you just added the reference and not the using statement.

Instead of the using statement you can also fully qualify the references like this:

byte[] encryptedData = System.Security.Cryptography.ProtectedData.Protect(
            Encoding.Unicode.GetBytes(ToInsecureString(input)), salt,
            System.Security.Cryptography.DataProtectionScope.CurrentUser);