如何在安全的上下文中使用不安全的代码？

Question

I need to use SecureString for a Microsoft's class and i found the following code on the internet :

public static class SecureStringExt
{
    public static SecureString ConvertToSecureString(this string password)
    {
        if (password == null)
            throw new ArgumentNullException("password");

        unsafe //Red highlighted line
        {
            fixed (char* passwordChars = password)
            {
                var securePassword = new SecureString(passwordChars, password.Length);
                securePassword.MakeReadOnly();
                return securePassword;
            }
        }
    }
}

The only problem is that the unsafe keyword keeps throwing me error saying Cannot use unsafe construct in safe context . Unfortunately i couldn't find why is this happening...

Note: The above code runs in LINQPad but not in VS2013 (with resharper).

Answer 1

I am not sure if you need unsafe code in that case (see answer of @mybirthname ).

But when unsafe code is needed, it can be enabled in Project properties.

• In the main menu, click Project and then <ProjectName> properties...
• Click on the Build page.
• Select Allow unsafe code .

Or one can specify /unsafe compiler option explicitly.

Answer 2

    public static SecureString GetSecureString(string password)
    {
        SecureString secureString = new SecureString();

        foreach (char c in password)
        {
            secureString.AppendChar(c);
        }

        secureString.MakeReadOnly();
        return secureString;
    }

You can make same thing without unsafe code.