C#:

{

TextBlock A = new TextBlock();

A.Text = "111";

A.Foreground = new SolidColorBrush(Color.FromArgb(255, 255, 0, 0));

Txt.Children.Add(A);

A = null;

TextBlock B = new TextBlock();

B.Text = "222";

B.Foreground = new SolidColorBrush(Color.FromArgb(255, 0, 255, 0));

Txt.Children.Add(B);

B = null;

TextBlock C = new TextBlock();

C.Text = "333";

C.Foreground = new SolidColorBrush(Color.FromArgb(255, 0, 0, 255));

Txt.Children.Add(C);

C = null;

}

需要换行加：A.TextWrapping=TextWrapping.Wrap