public static void TryFormatTest()
{
Span <char> buffer = stackalloc char[100];
TimeOnly timeOnly = TimeOnly.FromDateTime(DateTime.Now);
buffer.Fill(' ');
Assert.True(timeOnly.TryFormat(buffer, out int charsWritten));
Assert.Equal(charsWritten, buffer.TrimEnd().Length);
buffer.Fill(' ');
Assert.True(timeOnly.TryFormat(buffer, out charsWritten, "o"));
Assert.Equal(16, charsWritten);
Assert.Equal(16, buffer.TrimEnd().Length);
buffer.Fill(' ');
Assert.True(timeOnly.TryFormat(buffer, out charsWritten, "R"));
Assert.Equal(8, charsWritten);
Assert.Equal(8, buffer.TrimEnd().Length);
Assert.False(timeOnly.TryFormat(buffer.Slice(0, 3), out charsWritten));
Assert.False(timeOnly.TryFormat(buffer.Slice(0, 3), out charsWritten, "r"));
Assert.False(timeOnly.TryFormat(buffer.Slice(0, 3), out charsWritten, "O"));
Assert.Throws <FormatException>(() => {
Span <char> buff = stackalloc char[100];
timeOnly.TryFormat(buff, out charsWritten, "u");
});
Assert.Throws <FormatException>(() => {
Span <char> buff = stackalloc char[100];
timeOnly.TryFormat(buff, out charsWritten, "dd-yyyy");
});
Assert.Throws <FormatException>(() => $"{timeOnly:u}");
Assert.Throws <FormatException>(() => $"{timeOnly:dd-yyyy}");
}
public static void TryFormatTest()
{
Span <char> buffer = stackalloc char[100];
TimeOnly timeOnly = TimeOnly.FromDateTime(DateTime.Now);
Assert.True(timeOnly.TryFormat(buffer, out int charsWritten));
Assert.True(timeOnly.TryFormat(buffer, out charsWritten, "o"));
Assert.Equal(16, charsWritten);
Assert.True(timeOnly.TryFormat(buffer, out charsWritten, "R"));
Assert.Equal(8, charsWritten);
Assert.False(timeOnly.TryFormat(buffer.Slice(0, 3), out charsWritten));
Assert.False(timeOnly.TryFormat(buffer.Slice(0, 3), out charsWritten, "r"));
Assert.False(timeOnly.TryFormat(buffer.Slice(0, 3), out charsWritten, "O"));
}