将文本绑定到我的文本块是行不通的

Question

Here's the xaml:

<TextBlock Text="{Binding Errors}" Grid.Row="3" Foreground="Red"/>

Here's the ViewModel code:

  private string _errors = "";
 public string Errors
    {
        get { return this._errors; }
        set
        {
            if(_errors != value)
            {
                _errors = value;
                RaisePropertyChanged(() => Errors);
            }
        }
    }

and then in some function I change the _errors variable

  _errors = "Compiler Errors :\r\n";

But nothing happens in the TextBlock. What am I doing wrong?

Answer 1

You are setting _errors variable directly - so no RaisePropertyChanged fired. Try to set value by

Errors = = "Compiler Errors :\r\n";

Answer 2

private string _errors = "";
public string Errors
{
    get { return this._errors; }
    set
    {
        if(_errors != value)
        {
            _errors = value;
            RaisePropertyChanged("Errors");
        }
    }
}

set it like this :

Errors = "..."

I don't know how works the method RaisePropertyChanged, but if the lambda expression ()=>Errors is executed it will return the string contained in _errors and not the name of the property that changed ? So try to give directly the name of the property if the method exists.