SPSecurity.RunWithElevatedPrivileges Method

The secureCode object can be created from any method that is parameterless and returns void. See SPSecurity.CodeToRunElevated.

You can also bypass using the SPSecurity.CodeToRunElevated constructor by defining an anonymous method inside the call to RunWithElevatedPrivileges.

Important
If secureCode includes any write operations, then the call to RunWithElevatedPrivileges should be preceded by a call of either SPUtility.ValidateFormDigest() or SPWeb.ValidateFormDigest().

The first example shows RunWithElevatedPrivileges used with the SPSecurity.CodeToRunElevated constructor. In this example, GetSitesAndGroups is a parameterless method that returns void and is defined somewhere that can be accessed by the Button1_Click method.

protected void Button1_Click(object sender, EventArgs e)
{
   SPSecurity.CodeToRunElevated elevatedGetSitesAndGroups = new SPSecurity.CodeToRunElevated(GetSitesAndGroups);
   SPSecurity.RunWithElevatedPrivileges(elevatedGetSitesAndGroups);
}

The next example shows the syntax that is required to define an anonymous method in the call to RunWithElevatedPrivileges.

SPSecurity.RunWithElevatedPrivileges(delegate()
{
    // implementation details omitted
});

An SPSite object created outside the delegate can be referenced inside the delegate, however, the methods and property assessors of the object run with the privileges of the user context in which the objects were created, not with the elevated privileges. The same point applies to SPWeb objects and any other objects. You must create new objects inside the delegate if you need to execute the members of the objects with elevated privileges. If the new object must represent the same persisted entity as an object created outside the delegate, then you must reference identification information from the externally created object and use it to create the new object within the delegate. For example, if web is a reference to an SPWeb object created before the call to RunWithElevatedPrivileges, then the following code shows you would use the ID of its parent SPSite object to construct a new SPSite object.

SPSecurity.RunWithElevatedPrivileges(delegate()
{
    using (SPSite site = new SPSite(web.Site.ID))
    {
    // implementation details omitted
    }
});

Inside the delegate, members of the site object run with elevated privileges, but calls to members of web.Site would not. Note that the using keyword is used to ensure that the object is disposed in the delegate.

Reference

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