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Listing 3-27 shows some code in Label1_Load that uses common properties and methods of SPListItemCollection The code gets the SPWeb object from the current context and then gets the Announcements list Then the code does something that is questionable it sets the AllowUnsafeUpdates property of SPWeb to True We will return to this shortly to explain why this code is required to make this listing work and then why this is generally a bad idea Next we add an SPListItemCollection object to our code for the Announcements list After displaying the list name and item count, it then uses the Add method to add a new list item It sets the title for the new list item, then calls Update on the new SPListItem object Here is where the code will fail if AllowUnsafeUpdates is not set to True SharePoint does not allow you to add new items when code is running as a result of an HTTP GET in this case, the code is running to render the web part as part of an HTTP GET This is to prevent cross-site scripting attacks and to prevent a web page from modifying lists as a result of a page view triggered by a URL A safe way to add a new list item to a list is to do so when you are processing an HTTP POST for example when you are processing a button push in your web part or page For the purpose of this discussion, and to get our code in Load to add a new item, we have set AllowUnsafeUpdates to True, but this is not a practice you should follow After adding the new list item, we display the count We then use the Delete method to delete the item we just added Finally, we display the
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Working with Lists
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number of fields used in the list and we get a DataTable object and display the number of rows in the table The output for Listing 3-27 is shown in Listing 3-28
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Listing 3-27: Using SPListItemCollection in the Label1_Load visual web part handler in a farm solution uses the bad practice of setting AllowUnsafeUpdates to True
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Listing 3-28: Output of Listing 3-27
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3: Introduction to the SharePoint Object Model
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SPFolder The SPFolder object represents a folder in a SharePoint list Commonly used properties and methods of SPFolder are shown in Table 3-10 To get an SPFolder object, you typically start with an SPListItem object and use the Folder property that will return an SPFolder if the list item is a folder, otherwise it returns null Of the properties in Table 3-10, only the Audit property is not available to sandboxed solutions
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TABLE 3-10: Commonly Used Properties and Methods of the SPFolder
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Property or Method Name Url Files
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Description Returns the name of the folder Returns the site-relative URL of the folder Returns an SPFileCollection object that contains SPFile objects representing all the files found in the folder Returns the SPListItem object that corresponds to the folder Method that saves the changes made to the folder by using the SPFolder object s methods and properties Returns a Hashtable object with metadata associated with the folder in key value pairs Returns an SPFolderCollection object that contains SPFolder objects for all the subfolders contained within the folder Returns a bool value that indicates whether the folder exists Method that deletes the folder Method that puts the folder in SharePoint s recycle bin and returns the GUID associated with the folder Returns an SPAudit object representing the audit log for the folder
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Item Update()