Updating List View Web Part property in page

Question

I have a List View web part (In the page > Add web part > App > document library name). I need to update the TitleUrl property of this web part through C# code.

The SaveChanges() method below works for my visual web parts, but not for the List view webpart. I get an error saying: Exception has been thrown by the target of an invocation

webpartManager = myPage.GetLimitedWebPartManager(System.Web.UI.WebControls.WebParts.PersonalizationScope.Shared); webPart.TitleUrl = titleURL; webpartManager.SaveChanges(webPart); 

I did a casting as below

XsltListViewWebPart listViewWebPart = (XsltListViewWebPart)webPart; listViewWebPart.TitleUrl = titleURL; webpartManager.SaveChanges(listViewWebPart); 

But I get the error at SaveChanges() method.

An exception of type 'System.Reflection.TargetInvocationException' occurred in Microsoft.SharePoint.dll but was not handled in user code

The error description is as below

> at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] > arguments, Signature sig, Boolean constructor) at > System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, > Object[] parameters, Object[] arguments) at > System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags > invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) > at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] > index) at > Microsoft.SharePoint.WebPartPages.BinaryWebPartSerializer.DoesPersonalizedPropertValueMatchDefaultValue(SPPersonalizablePropertyEntry > spPersonalizablePropertyEntry, Object value, Control defaultControl) > at > Microsoft.SharePoint.WebPartPages.BinaryWebPartSerializer.Serialize(PersonalizationScope > scope, BinaryWebPartSerializerFlag binaryWebPartSerializerFlags, > BinaryWebPartSerializerWriter writer) at > Microsoft.SharePoint.WebPartPages.BinaryWebPartSerializer.Serialize(SerializationMode > mode, BinaryWebPartSerializerFlag binaryWebPartSerializerFlags, > SPSerializationBinderBase serializationBinder, > BinaryWebPartSerializerWriter writer) at > Microsoft.SharePoint.WebPartPages.BinaryWebPartSerializer.Serialize(SerializationMode > mode, BinaryWebPartSerializerFlag binaryWebPartSerializerFlags, > SPSerializationBinderBase serializationBinder) at > Microsoft.SharePoint.WebPartPages.SPWebPartManager.SaveChangesCore(SPLayoutProperties > layoutProperties, Boolean httpGet, Boolean saveCompressed, Boolean > skipRightsCheck, Boolean skipSafeAgainstScriptCheck, WebPartTypeInfo& > newTypeId, Byte[]& newAllUsersProperties, Byte[]& > newPerUserProperties, String[]& newLinks) at > Microsoft.SharePoint.WebPartPages.SPWebPartManager.SaveChangesInternal(SPLayoutProperties > layoutProperties, Boolean skipRightsCheck, Boolean > skipSafeAgainstScriptCheck) at > Microsoft.SharePoint.WebPartPages.SPWebPartManager.SaveChanges(Guid > storageKey) at > Microsoft.SharePoint.WebPartPages.SPLimitedWebPartManager.SaveChanges(WebPart > webPart) at > WSP.ABC.ABC.ABCWindow.<>c__DisplayClass5.<ChangeWebPartProperties>b__4() > at > Microsoft.SharePoint.SPSecurity.<>c__DisplayClass5.<RunWithElevatedPrivileges>b__3() > at > Microsoft.SharePoint.Utilities.SecurityContext.RunAsProcess(CodeToRunElevated > secureCode) 

any reason why ?

Answer 1

The following approach works for me. Instead of casting, I use the Properties collection.

You would of course have to change the creation of the context / authentication and the way you look for the specific WebPart which in this case is done by title.

using System; using System.Linq; using Microsoft.SharePoint.Client; using Microsoft.SharePoint.Client.WebParts; namespace SharePointTest1 { class Program { private static void ShowWebPartProperties(string webFullUrl, string fileName, string webPartTitle) { using (var context = new ClientContext(webFullUrl)) { context.Credentials = System.Net.CredentialCache.DefaultCredentials; File file = context.Web.GetFileByServerRelativeUrl(fileName); LimitedWebPartManager wpm = file.GetLimitedWebPartManager(PersonalizationScope.Shared); context.Load(wpm.WebParts, wps => wps.Include( wp => wp.WebPart.Title)); context.ExecuteQuery(); foreach (WebPartDefinition wpd in wpm.WebParts) { WebPart wp = wpd.WebPart; if (wp.Title == webPartTitle) { Console.WriteLine(wp.Title + " found. Showing properties:"); var properties = wp.Properties; context.Load(properties); context.ExecuteQuery(); foreach (var item in properties.FieldValues.Keys.OrderBy(m => m).ToList()) { Console.WriteLine(string.Format("{0} = {1}", item, properties.FieldValues[item])); } break; } } Console.WriteLine(""); } } private static void ChangeWebPartProperty(string webFullUrl, string fileName, string webPartTitle, string propertyName, object propertyValue) { using (var context = new ClientContext(webFullUrl)) { context.Credentials = System.Net.CredentialCache.DefaultCredentials; File file = context.Web.GetFileByServerRelativeUrl(fileName); LimitedWebPartManager wpm = file.GetLimitedWebPartManager(PersonalizationScope.Shared); context.Load(wpm.WebParts, wps => wps.Include( wp => wp.WebPart.Title)); context.ExecuteQuery(); foreach (WebPartDefinition wpd in wpm.WebParts) { WebPart wp = wpd.WebPart; if (wp.Title == webPartTitle) { Console.WriteLine(wp.Title + " found"); wp.Properties[propertyName] = propertyValue; wpd.SaveWebPartChanges(); context.ExecuteQuery(); break; } } } } static void Main(string[] args) { try { ShowWebPartProperties("http://localhost/DocumentLibraryTest/", "/DocumentLibraryTest/SitePages/Home.aspx", "Documents"); ChangeWebPartProperty("http://localhost/DocumentLibraryTest/", "/DocumentLibraryTest/SitePages/Home.aspx", "Documents", "TitleUrl", "http://evolootion.net"); } catch (Exception ex) { Console.WriteLine(ex); } Console.WriteLine("Finished"); Console.ReadLine(); } } }