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This exception is thrown because you re trying to use the SharePoint object model, which isn t allowed by the default minimal CAS policy. To allow the solution to execute this code, you must add a custom CAS policy to the solution. A custom CAS policy is defined in the solution manifest for the package. Once deployed it s merged with the current policy of the web application. During installation, the trust level in web.config will be changed to WSS_Custom, which points to the merged policy file in {SharePoint Root}\Config. This custom policy file contains the default policy file and all merged custom CAS policies. To add a custom policy to the solution, use the Package editor. In the Package designer, select the Manifest tab and then click Edit Options to bring up the editor. You can use the Package editor to add additional XML to the solution manifest, and the custom XML will be merged with the automatically generated XML and form the final solution manifest. The custom CAS policy must contain the permission request that your application needs, in this example, that s Microsoft.SharePoint.Security.SharePointPermission. But the policies aren t inherited from the default policy, so you need to add all the policies needed to run the application. Listing 7.7 shows the custom CAS policy needed to run a Web Part that requires access to the SharePoint API. This XML is written into the Package Manifest template.

Document d = new Document();

try {

dload(url);

< xml version="1.0" encoding="utf-8" > <Solution xmlns="http://schemas.microsoft.com/sharepoint/"> <CodeAccessSecurity> Define <PolicyItem> permission set <PermissionSet class="NamedPermissionSet" version="1" Add permission Description="My permission set"> request <IPermission class="AspNetHostingPermission" version="1" Level="Minimal"/> <IPermission class="SecurityPermission" version="1" Flags="Execution,ControlPrincipal,ControlAppDomain, ControlDomainPolicy,ControlEvidence,ControlThread"/> <IPermission class="Microsoft.SharePoint.Security.SharePointPermission, Microsoft.SharePoint.Security, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" version="1" ObjectModel="true"/> </PermissionSet> <Assemblies> <Assembly Name="$SharePoint.Project. Add assembly AssemblyFileNameWithoutExtension$"/>

catch (ParseException e3) {

dreportError(e3, Systemout);

if (d != null) {

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The custom CAS policy consists of policy item, which contains permission sets B. The permission set is of the type NamedPermissionSet, and it s given a description. For each requested permission, an IPermission element is added C. The first granted permission is AspNetHostingPermission, which is used to gain minimal access to ASP.NET. The SecurityPermission is used with a set of flags to grant security permissions. The last permission grant is the one needed to access the SharePoint API. The ObjectModel attribute grants access to the application using the CAS policy to access SharePoint using the object model. Finally, the permission set is given to one or more assemblies, in this case the current Web Part assembly D. The Visual Studio replaceable token is used here to insert the assembly filename. Building custom CAS policies might be difficult at first because it involves using several different permission classes. I suggest that you start with a limited CAS policy, similar to the one discussed earlier, and then test the solution. The exceptions thrown usually give detailed information on which requested permission is required for the application to run.

text2setText(dgetText());

.

doTree(elem2);

public extendedFrame(String str)

As of this writing, Visual Studio 2010 contains a bug that prohibits Visual Studio 2010 from deploying solutions with CAS policies. You ll get an error like this: Error occurred in deployment step Add Solution : Property set method not found. Fortunately there s a workaround for this error detailed in Microsoft Knowledge Base article KB2022463 (http://support.microsoft.com/kb/2022463). This article contains instructions on configuring Visual Studio to accept CAS policies. In future service packs of Visual Studio, this bug will likely be fixed.

super (str);

public boolean handleEvent(Event evt)

switch (evtid)

Very few applications never need an update. The easy way to upgrade is to remove and reinstall the application, which is done in SharePoint by retracting and redeploying the solution. A better approach is to use the built-in functionality to upgrade a solution. (Previous versions of SharePoint could also do this, but the functionality was of limited use.) In application life-cycle management, it s good practice to use versioning of your code and assemblies. Due to annoying limitations and complicated workarounds, versioning of assemblies wasn t often used in SharePoint projects prior to SharePoint 2010. As you ll see in this section, this new version leverages native .NET features to make it easier to work with versioning in SharePoint. This section also discusses how to handle updating of Web Parts when you ve removed, added, or renamed properties.

case EventWINDOW_DESTROY:

dispose();

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