topic Re: Bind a TextBlock to the Map's Resolution in ArcGIS API for Silverlight Questions

Bind a TextBlock to the Map's Resolution

TedChapin — Tue, 22 Feb 2011 16:49:32 GMT

Does anyone know why this:

<TextBlock Text="{Binding Resolution, ElementName=MapMain, Mode=OneWay}" ></TextBlock>

produces "NaN" instead of the map's resolution? I tried the same thing with the map's Extent.Width property and it works fine.

Re: Bind a TextBlock to the Map's Resolution

JenniferNery — Sat, 11 Dec 2021 18:45:43 GMT

I think you have it correctly if your map control is named "MapMain". However, v2.1 and earlier do not support Binding for "Resolution", this is new to v2.2

The following code will only work for v2.2 and up:

<TextBlock Text="{Binding ElementName=MyMap, Path=Resolution}" VerticalAlignment="Top" HorizontalAlignment="Center"/>

The following code will work for v2.1 and earlier:

<TextBlock x:Name="MyResolution" Text="0" VerticalAlignment="Top" HorizontalAlignment="Center"/>
private void MyMap_ExtentChanged(object sender, ExtentEventArgs e)
{
 double res = Convert.ToDouble(MyResolution.Text);
 if (res != (sender as Map).Resolution)
 {
  res = (sender as Map).Resolution;
  MyResolution.Text = res.ToString();
 }
}

Re: Bind a TextBlock to the Map's Resolution

DavidLamb — Wed, 02 Mar 2011 20:27:09 GMT

I think you have it correctly if your map control is named "MapMain". However, v2.1 and earlier do not support Binding for "Resolution", this is new to v2.2

Where is v2.2 available?

Thanks,
David

Re: Bind a TextBlock to the Map's Resolution

JenniferNery — Thu, 03 Mar 2011 00:39:21 GMT

When it becomes available, there should be a link from here: http://help.arcgis.com/en/webapi/silverlight/index.html
to beta community site: https://betacommunity.esri.com/home.html