c# - Converters, sending a String and returning a int -

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I have this converter that returns the number of the width of textbox according to the number of characters (Value value, type target type, object parameter, cultureinfo culture) {string}: {valueConversion (typef (string), typef (int)) public class textdown: g = (string) value; Return g.Length * 10; } Public Object Convertback (type object type, type target type, object parameter, cultureinfo culture) {return tap; In the definition of a grid in the column, I tried to use this converter, but received an error in which the IVALueConverter does not support converting with TypeConverter string. I know that control: textbox hailer. Label is a string: 

  & lt; Column Definition Width = "{TemplateBinding Controls: TextboxHelper.Label, Converter = ToWidth}" />   
 Why did this happen and what is the solution?   
 
 
 I just change this line:  
  & lt; Column Definition Width = "{TemplateBinding Controls: TextboxHelper.Label, Converter = ToWidth}" />   
 to:  
  & lt; Column Definition Width = "{TemplateBinding Control: TextboxHelper.Label, Converter = {StaticResource ToWidth}}" />

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