在windows8 metro中计算TextBox的实际宽度ActualWidth

                TextBlock block = new TextBlock();
                block.Text = "hello";
                Size size = new Size(1024, 1024);
                block.Measure(size);
                Canvas.SetLeft(block, leftMargin - block.ActualWidth);

借鉴1：可惜rect方法我试了下ActualWidth还是0.0

在windows8 metro/windows phone中计算字的宽度

在windows 8和windows phone中有地方我们需要计算字的宽度，例如在显示的时候需要截取多余的字变成...，还有在数据排版上面这个也是必不可少的。

一个字符显示的像素宽度与字体和字体大小有关系。我用到的是一个比较笨拙的方法，那就是拿textblock去量。

具体如下：

TextBlock tb = new  TextBlock();
    tb.FontFamily = new  System.Windows.Media.FontFamily( "微软雅黑" );
    tb.FontSize = 50;
    tb.Text = "hello" ;
    System.Diagnostics.Debug.WriteLine( "宽度："  + tb.ActualWidth + " 高度:"  + tb.ActualHeight);

 这个方法很简单，但是到windows 8上面就不一样了。

在win8 metro程序里面，TextBlock必须要显示到UI上才能得到它的宽度和高度。这就麻烦了。

最后发现一个东西能够将它量出来。那就是矩形。

Rect rect = new  Rect(0, 0, 1024, 1024);

TextBlock tb = new  TextBlock();
tb.FontFamily = new  FontFamily( "微软雅黑" );
tb.FontSize = 50;
tb.Text = "hello" ;
tb.Arrange(rect);
System.Diagnostics.Debug.WriteLine( "宽度："  + tb.ActualWidth + " 高度:"  + tb.ActualHeight);

借鉴2：在stackoverflow上找到了

how to calculate the textbock height and width in on load if i create textblock from code?

4 down vote favorite

TextBlock tbl= new TextBlock(); tbl.text="Kishore"; double x=tbl.ActualHeight; double y=tbl.ActualWidth; If i execute the code from the loaded event in Metro - winRT will return 0 for both. How can I get the ActualWidth in the Loaded or SizeChanged event? c#  windows-8  windows-runtime  winrt-xaml  actualwidth share | improve this question edited  Jun 16 at 0:20 Dave Clemmer 2,215 9 27 57 asked  May 11 '12 at 17:32 Kishore Kumar 7,009 4 22 50

WPF had methods like arrange/measure, you gave available space and got dimensions as a result. Isn't there something similar in Jupiter? –   Filip Skakun  May 12 '12 at 0:30

1 Answer

active oldest votes

up vote 5 down vote accepted	Call Measure() then Arrange() and then ActualWidth and ActualHeight will be updated. share | improve this answer edited  Jun 16 at 0:19 Dave Clemmer 2,215 9 27 57 answered  May 12 '12 at 2:14 Filip Skakun 15.3k 2 17 42
	First, Measure is called, then Arrange. –   HCL  Nov 10 '12 at 11:05 Right, of course! –   Filip Skakun  Nov 10 '12 at 16:25