Surprisingly this is the only question about this topic in SOF (the other one is closed). To complete newbies in WPF (like me) it is hard to find good and at the same time simple information, so I will show how I managed to use custom images in programatically added pushpins in VB.NET:
This is my MainWindow.xaml file:
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:m="clr-namespace:Microsoft.Maps.MapControl.WPF;assembly=Microsoft.Maps.MapControl.WPF"
xmlns:local="clr-namespace:MyBingMapsApp"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<ControlTemplate x:Key="PushpinControlTemplate" TargetType="m:Pushpin">
<Grid>
<Rectangle Width="24" Height="24">
<Rectangle.Fill>
<ImageBrush ImageSource= "Resources/marker_green.png"/>
</Rectangle.Fill>
</Rectangle>
</Grid>
</ControlTemplate>
</Window.Resources>
<Grid>
<m:Map x:Name="myMap"
CredentialsProvider= "xxxxxx mycredentialskey xxxxxxxx"
Center="42.13618,-0.40822"
ZoomLevel="15">
</m:Map>
</Grid>
</Window>
As you can see, you must define a ControlTemplate
whose TargetType="m:Pushpin"
There you can draw whatever you need. The simplest: use an image from your resources.
Important: change image "Build action" to Resource (click on the image in your resources folder of the Solution Explorer and change it in Advanced settings). Otherwise you will have to hardwrite the image path or use Uris or more complicated stuff
Now you are ready to create a pushpin wherever you need and assign your template:
mypin = New Pushpin
mypin.Location = New Location(mylat, mylon)
mypin.ToolTip = "This is a pushpin with custom image"
Dim mytemplate As System.Windows.Controls.ControlTemplate = FindResource(“PushpinControlTemplate”) 'here of course you must put the key name of your template
mypin.Template = mytemplate