c# - Check if TextBlock has Multiple Lines -

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I have a TextBlock , which I want to be as big as possible without several lines. I need to see if it flows on the next line so that I can reduce the size of the text. I can not set the maximum line for 1, because after this it will cut my text, how can I see that many rows are being used in my TextBlock ?

In a way I was thinking, but could not understand, something like this is: 

  if (TextBlock.Text.Width> TextBlock.Width)   
 or  
  If (TextBlock.Height> TextBlock   
 but this does not seem like what I have seen.   
 
 
 I agree with a little comment, but if you want to do this, you will see a view box You can use controls and insert the text block inside it.

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