Exception thrown in SSCE 3.5 Beta2 but not in 3.5 beta1and early versions（来自MSDN Forum）

原文地址：http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2001893&SiteID=1 I replace 
   I replace the reference assembly System.Data.SqlServerCe with version 3.5 beta2 in Microsoft.Practices.EnterpriseLibrary.Data.SqlCe. When I used the Data.SqlCe block in application, an exception ("Cannot access a disposed object named SqlCeConnection") threw. This didn't occur in SSCE 3.5 beta1 and early versions.

   Finally I found the difference between beta1 and beta2.

   In the SqlCeConnection class, there is a RemoveWeakReference method. this is code snippet of beta1:

internal void RemoveWeakReference(object value)
            {
            if (this.weakReferenceCache != null)
            {
            this.weakReferenceCache.Remove(value);
            }
            }

 and this is for beta2:

            
internal void RemoveWeakReference(object value)
            {
            if (this.weakReferenceCache == null)
            {
            throw new ObjectDisposedException("SqlCeConnection");
            }
            this.weakReferenceCache.Remove(value);
            }
            
            

So, if we dispose a connection before a command, such as:

SqlCeConnection cn;

SqlCeCommand cmd;

...

cn.Dispose();

cmd.Dispose(); // Error, an exception will be threw.

Is it a bug of Beta2?

=================================================
This is a issue in Beta2. Most probably we will fix in SSCE 3.5 RTM. The Bug Id: 13211 tracks this issue.