将WPF文本设置为TextBlock

Question

I know that TextBlock can present a FlowDocument , for example:

<TextBlock Name="txtFont">
     <Run Foreground="Maroon" FontFamily="Courier New" FontSize="24">Courier New 24</Run>
</TextBlock>

I would like to know how to set a FlowDocument that is stored in a variable to a TextBlock . I am looking for something like:

string text = "<Run Foreground="Maroon" FontFamily="Courier New" FontSize="24">Courier New 24</Run>"
txtFont.Text = text;

However, The result of the code above is that the XAML text is presented unparsed.

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EDIT: I guess my question was not clear enough. What I'm really trying to achive is:

1. The user input some text into a RichTextBox .
2. The application saves the user input as FlowDocument from the RichTextBox , and serializes it to the disk.
3. The FlowDocument is deserialized from the disk to the variable text .
4. Now, I would like to be able to present the user text in a TextBlock .

Therefore, as far as I understand, creating a new Run object and setting the parameters manually will not solve my problem.

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The problem is that serializing RichTextBox creates Section object, which I cannot add to TextBlock.Inlines . Therefore, it is not possible to set the deserialized object to TextProperty of TextBlock .

Answer 1

create and add the object as below:

        Run run = new Run("Courier New 24");
        run.Foreground = new SolidColorBrush(Colors.Maroon);
        run.FontFamily = new FontFamily("Courier New");
        run.FontSize = 24;
        txtFont.Inlines.Add(run);

Answer 2

I know that TextBlock can present FlowDocument

What makes you think that ? I don't think it's true... The content of a TextBlock is the Inlines property, which is an InlineCollection . So it can only contain Inline s... But in a FlowDocument , the content is the Blocks property, which contains instances of Block . And a Block is not an Inline

Answer 3

If your FlowDocument has been deserialized , it means that you have an object of type FlowDocument , right? Try setting the Text property of your TextBlock to this value. Of course, you cannot do this with txtFont.Text = ... , since this only works for strings. For other types of objects, you need to set the DependencyProperty directly:

txtFont.SetValue(TextBlock.TextProperty, myFlowDocument)

Answer 4

Here is how we are setting the look of a textblock by assigning a style on-the-fly.

    // Set Weight (Property setting is a string like "Bold")
    FontWeight thisWeight = (FontWeight)new FontWeightConverter().ConvertFromString(Properties.Settings.Default.DealerMessageFontWeightValue);

    // Set Color (Property setting is a string like "Red" or "Black")
    SolidColorBrush thisColor = (SolidColorBrush)new BrushConverter().ConvertFromString(Properties.Settings.Default.DealerMessageFontColorValue);

    // Set the style for the dealer message
    // Font Family Property setting  is a string like "Arial"
    // Font Size Property setting is an int like 12, a double would also work
    Style newStyle = new Style
    {
        TargetType = typeof(TextBlock),
        Setters = {
            new Setter 
            {
                Property = Control.FontFamilyProperty,
                Value = new FontFamily(Properties.Settings.Default.DealerMessageFontValue)
            },
            new Setter
            {
                Property = Control.FontSizeProperty,
                Value = Properties.Settings.Default.DealerMessageFontSizeValue
            },
            new Setter
            {
                Property = Control.FontWeightProperty,
                Value = thisWeight
            },
            new Setter
            {
                Property = Control.ForegroundProperty,
                Value = thisColor
            }
        }
    };

    textBlock_DealerMessage.Style = newStyle;

You can eliminate the style section and set properties directly, but we like keeping things bundled in the style to help us organize the look throughout the project.

textBlock_DealerMessage.FontWeight = thisWeight;

HTH.