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WPF TextBox with C#

Posted by Mahesh Chand Articles | WPF March 18, 2010
This article demonstrates how to create and use a TextBox control in WPF using XAML and C#.
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WPF TextBox

This article demonstrates how to create and use a TextBox control in WPF using XAML and C#.

Creating a TextBox

The TextBox element represents a WPF TextBox control in XAML.

 

<TextBox/>

 

The Width and Height attributes of the TextBox element represent the width and the height of a TextBox. The Text property of the TextBox element sets the content of a TextBox. The Name attribute represents the name of the control, which is a unique identifier of a control.

 

The code snippet in Listing 1 creates a TextBox control and sets the name, height, width, and content of a TextBox control.

 

<TextBox Name="TextBox1" Height="30" Width="200"

        Text="Hello! I am a TextBox.">           

</TextBox>

Listing 1

The output looks like Figure 1.

TextBoxImg1.jpg

Figure 1

As you can see from Figure 1, by default the TextBox is place in the center of the page. We can place a TextBox control where we want by using the Margin, VerticalAlignment and HorizontalAlignment attributes that sets the margin, vertical alignment, and horizontal alignment of a control.

The code snippet in Listing 2 sets the position of the TextBox control in the left top corner of the page.

<TextBox Name="TextBox1" Height="30" Width="200"

        Text="Hello! I am a TextBox."

        Margin="10,10,0,0" VerticalAlignment="Top"

        HorizontalAlignment="Left">           

</TextBox>

Listing 2

Formatting a TextBox

The BorderBrush property of the TextBox sets a brush to draw the border of a TextBox. You may use any brush to fill the border. The code snippet in Listing 3 uses a linear gradient brush to draw the border with a combination of red and blue color.

<TextBox.BorderBrush>

    <LinearGradientBrush StartPoint="0,0" EndPoint="1,1" >

        <GradientStop Color="Blue" Offset="0" />

        <GradientStop Color="Red" Offset="1.0" />

    </LinearGradientBrush>

</TextBox.BorderBrush>

Listing 3

 

The Background and Foreground properties of the TextBox set the background and foreground colors of a TextBox. You may use any brush to fill the border. The following code snippet uses linear gradient brushes to draw the background and foreground of a TextBox.

 

<TextBox.Background>

    <LinearGradientBrush StartPoint="0,0" EndPoint="1,1" >

        <GradientStop Color="Blue" Offset="0.1" />

        <GradientStop Color="Orange" Offset="0.25" />                   

        <GradientStop Color="Green" Offset="0.75" />

        <GradientStop Color="Red" Offset="1.0" />

    </LinearGradientBrush>

</TextBox.Background>

<TextBox.Foreground>

    <LinearGradientBrush StartPoint="0,0" EndPoint="1,1" >                   

        <GradientStop Color="Orange" Offset="0.25" />

        <GradientStop Color="White" Offset="1.0" />                   

    </LinearGradientBrush>

</TextBox.Foreground>

The new TextBox looks like Figure 2.

TextBoxImg2.jpg

Figure 2

 

Setting Image as Background of a TextBox

To set an image as background of a TextBox, we can set an image as the Background of the TextBox. The code snippet in Listing 4 sets the background of a TextBox to an image. 

<TextBox.Background>

    <ImageBrush ImageSource="dock.jpg" />

</TextBox.Background>

Listing 4

The new output looks like Figure 3.

TextBoxImg3.jpg

Figure 3

Creating a TextBox Dynamically

The code listed in Listing 5 creates a TextBox control programmatically. First, it creates a TextBox object and sets its width, height, contents, background and foreground and later the TextBox is added to the LayoutRoot.

private void CreateATextBox()

{

    TextBox txtb= new TextBox();

    txtb.Height = 50;

    txtb.Width = 200;

    txtb.Text = "Text Box content";

    txtb.Background = new SolidColorBrush(Colors.Orange);

    txtb.Foreground = new SolidColorBrush(Colors.Black);

    LayoutRoot.Children.Add(txtb);

}

Listing 5

Setting Fonts of TextBox Contents

The FontSize, FontFamily, FontWeight, FontStyle, and FontStretch properties are used to set the font size, family, weight, style and stretch to the text of a TextBox. The code snippet in Listing 6 sets the font properties of a TextBox.

FontSize="14" FontFamily="Verdana" FontWeight="Bold"

Listing 6

The new output looks like Figure 4.

TextBoxImg4.jpg

Figure 4

The FontSource property allows loading custom fonts dynamically. The following code snippet sets the FontSource property.

Uri fontUri = new Uri("SomeFont.ttf", UriKind.Relative);
StreamResourceInfo MySRI = Application.GetResourceStream(fontUri);
TextBox1.FontSource = new FontSource(MySRI.Stream);
 

Non Editable TextBox

The IsReadOnly property of the TextBox sets the text box read only. By default, it is false.

IsReadOnly="True"

 

Restricting Text Size of a TextBox

The MaxLength property of the TextBox sets the number of characters allowed to input in a text box.

MaxLength="250"

 

Scrolling, Alignment, and Wrapping

 

The HorizontalScrollBarVisibility and VerticalScrollBarVisibility properties are used to set horizontal and vertical scroll bars of a TextBox, which is of type ScrollBarVisibility enumeration. The ScrollBarVisibility enumeration has four values – Disabled, Auto, Hidden, and Visible. The following code snippet sets the horizontal and vertical scroll bars visible in a TextBox.

HorizontalScrollBarVisibility="Visible"

VerticalScrollBarVisibility="Auto"

 

The TextWrapping property sets the wrap of no warp text. The following code snippet sets the wrapping text option.

TextWrapping="Wrap"

The TextAlignment property sets the text alignment in a TextBox, which is of type TextAlignment enumeration. A text can be aligned left, center, or right. 

TextAlignment="Right"

The AcceptReturn property sets if the return is accepted in a TextBox or not.   

AcceptsReturn="True"

Listing 7 shows all these properties in a complete sample.

<TextBox Name="TextBox2" Margin="10,10,50,0"

         Width="300" Height="150"

         HorizontalScrollBarVisibility="Visible"

         VerticalScrollBarVisibility="Visible"

         TextWrapping="Wrap"

         TextAlignment="Right"

         MaxLength="500"

         IsReadOnly="False"

         AcceptsReturn="True" >           

</TextBox>

Listing 7

Selection in TextBox

The Select and SelectAll methods are used to select text in a TextBox. The Select method select a text range in a TextBox and the SelectAll method select all text in a TextBox.

The SelectionBackground and SelectionForeground properties set the background and foreground colors of the selected text. The SelectedText property returns the selected text in a TextBox.

The code in Listing 8 sets the selected text background and foreground properties and on button click event handler, returns the selected text of the TextBox.

private void TextBox2Functionality()

{

    string textBoxData =  "Hey I am a text with scrolling and return functionality.";

    textBoxData += " You can select text it me and get the selected data. ";

    textBoxData += " How about setting background and foreground color of the selected text?. ";

    textBoxData += " Maximum lenght and a lot more to offer. ";

    textBoxData += " You can select text it me and get the selected data. ";

    textBoxData += " You can select text it me and get the selected data. ";

    textBoxData += " Also sets the selection background and foreground ";

    textBoxData += " Set font size and the font name. ";

    textBoxData += " You can select text it me and get the selected data. ";

    textBoxData += " Also sets the selection background and foreground ";

    textBoxData += " Set font size and the font name. ";

    textBoxData += " You can select text it me and get the selected data. ";

 

    TextBox2.Text = textBoxData;

    TextBox2.FontFamily = new FontFamily("Georgia");

    TextBox2.FontSize = 12;

    TextBox2.SelectionBackground = new SolidColorBrush(Colors.Blue);

    TextBox2.SelectionForeground = new SolidColorBrush(Colors.White);

    TextBox2.SelectionStart = 100;

    TextBox2.SelectionLength = 200;

}

private void Button_Click(object sender, RoutedEventArgs e)

{

  MessageBox.Show(TextBox2.SelectedText);

}

Listing 8

The new output looks like Figure 5.

TextBoxImg5.jpg

Figure 5

Summary

In this article, I discussed how we can create and format a TextBox control in WPF and C#.  After that we saw how to create a TextBox control dynamically. Then we saw how to set various properties of a TextBox such as making it non editable, restrict the size of text, and set the foreground an d background of the selected text.

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