SilverlightHost.InitParams Property

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Gets the initialization parameters that were passed as part of HTML initialization of a Silverlight plug-in.

Namespace:  System.Windows.Interop
Assembly:  System.Windows (in System.Windows.dll)


Public ReadOnly Property InitParams As IDictionary(Of String, String)
public IDictionary<string, string> InitParams { get; }

Property Value

Type: System.Collections.Generic.IDictionary<String, String>
The set of initialization parameters, as a dictionary with key strings and value strings.


The initialization parameters are passed as the initParams parameter when you embed the Silverlight plug-in in a Web page. For more information about hosting the plug-in, see Integrating Silverlight with a Web Page.

Initialization parameters are not available to out-of-browser applications. However, you can use isolated storage to save initialization parameters before a user installs an application for out-of-browser use. You can then retrieve the parameters from isolated storage when the application launches outside the browser. For more information, see How to: Specify and Retrieve Custom Initialization Parameters.

The input format of this parameter starts as a single string with individual parameters delimited using a comma (,), and keys delimited from values using an equal sign (=). For example, "key1=value1,key2=value2,key3=value3". The delimiters are processed so that this API can provide them as a dictionary.

You can also access the initialization parameters in an Application.Startup event handler through the StartupEventArgs.InitParams property and in an IApplicationService.StartService method implementation through the ApplicationServiceContext.ApplicationInitParams property.

Version Information


Supported in: 5, 4, 3


For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.