public static void TryFormatTest()
{
Span <char> buffer = stackalloc char[100];
DateOnly dateOnly = DateOnly.FromDateTime(DateTime.Today);
Assert.True(dateOnly.TryFormat(buffer, out int charsWritten));
Assert.True(dateOnly.TryFormat(buffer, out charsWritten, "o"));
Assert.Equal(10, charsWritten);
Assert.True(dateOnly.TryFormat(buffer, out charsWritten, "R"));
Assert.Equal(16, charsWritten);
Assert.False(dateOnly.TryFormat(buffer.Slice(0, 3), out charsWritten));
Assert.False(dateOnly.TryFormat(buffer.Slice(0, 3), out charsWritten, "r"));
Assert.False(dateOnly.TryFormat(buffer.Slice(0, 3), out charsWritten, "O"));
}
public static void TryFormatTest()
{
Span <char> buffer = stackalloc char[100];
DateOnly dateOnly = DateOnly.FromDateTime(DateTime.Today);
Assert.True(dateOnly.TryFormat(buffer, out int charsWritten));
Assert.True(dateOnly.TryFormat(buffer, out charsWritten, "o"));
Assert.Equal(10, charsWritten);
Assert.True(dateOnly.TryFormat(buffer, out charsWritten, "R"));
Assert.Equal(16, charsWritten);
Assert.False(dateOnly.TryFormat(buffer.Slice(0, 3), out charsWritten));
Assert.False(dateOnly.TryFormat(buffer.Slice(0, 3), out charsWritten, "r"));
Assert.False(dateOnly.TryFormat(buffer.Slice(0, 3), out charsWritten, "O"));
Assert.Throws <FormatException>(() => {
Span <char> buff = stackalloc char[100];
dateOnly.TryFormat(buff, out charsWritten, "u");
});
Assert.Throws <FormatException>(() => {
Span <char> buff = stackalloc char[100];
dateOnly.TryFormat(buff, out charsWritten, "hh-ss");
});
Assert.Throws <FormatException>(() => $"{dateOnly:u}");
Assert.Throws <FormatException>(() => $"{dateOnly:hh-ss}");
}