using System.Diagnostics.CodeAnalysis; using System.Runtime.CompilerServices; using Windows.Win32.Graphics.Gdi; namespace System { [NullableContext(2)] [Nullable(0)] internal static class ArgumentValidation { [return: Nullable(1)] internal static T OrThrowIfNull<T>([NotNull] this T argument, [CallerArgumentExpression("argument")] string paramName = null) { ArgumentNullException.ThrowIfNull(argument, paramName); return argument; } [return: Nullable(1)] internal static T OrThrowIfNullWithMessage<T>([NotNull] this T argument, [Nullable(1)] string message, [CallerArgumentExpression("argument")] string paramName = null) { if (argument != null) return argument; throw new ArgumentNullException(paramName, message); } internal static IntPtr OrThrowIfZero(this IntPtr argument, [CallerArgumentExpression("argument")] string paramName = null) { if (argument != (IntPtr)0) return argument; throw new ArgumentNullException(paramName); } [return: Nullable(1)] internal static string OrThrowIfNullOrEmpty([NotNull] this string argument, [CallerArgumentExpression("argument")] string paramName = null) { argument.ThrowIfNullOrEmpty(paramName); return argument; } internal static void ThrowIfNullOrEmpty([NotNull] this string argument, [CallerArgumentExpression("argument")] string paramName = null) { if (string.IsNullOrEmpty(argument)) throw new ArgumentNullException(paramName); } internal static void ThrowIfNullOrEmptyWithMessage([NotNull] this string argument, [Nullable(1)] string message, [CallerArgumentExpression("argument")] string paramName = null) { if (string.IsNullOrEmpty(argument)) throw new ArgumentNullException(paramName, message); } internal static void ThrowIfNull(HDC argument, [CallerArgumentExpression("argument")] string paramName = null) { if (argument.IsNull) throw new ArgumentNullException(paramName); } } }