Sunday, March 20, 2011

PresentationFontCache issue – IndexOutOfRangeException when running WPF application

A few days back, I came across this IndexOutOfRangeException with PresentationFontCache when running our WPF application on a Windows 7 machine. I tried disabling and enabling .NET framework from Add/Remove components but nothing seemed to fix this.

PresentationFontCache service optimizes performance of WPF applications by caching commonly used font data.

One of the following two fixes seem to work for different peoples.

  1. PresentationFontCache data is stored at [Windows]\ServiceProfiles\LocalService\AppData\Local\FontCache*.dat. Some of the guys have fixed this problem after deleting this file from here and restarting Windows Presentation Font Cache service.
  2. Disabling Windows Presentation Font Cache service worked for me. I don’t know why but just stopping the service did not work for me.

Refer to following thread for some more discussions -

Thursday, March 10, 2011

Large file transfer in WCF in IIS 7 - There was no endpoint listening at xxx that could accept the message

I had hosted a WCF web service on IIS 7 that needed to transfer large files (~100 MB) to and from the service. I had all of maxReceivedMessageSize, maxBufferSize, maxItemsInObjectGraph, maxRequestLength configured to sufficiently large values, but still i was getting above mentioned exception when transferring greater than 30 MB files.

In IIS 7, there is one more setting called maxAllowedContentLength which is by default 30000000 byte (just over 28 MB). You need to tweak this value according to your need. Following snippet shows where it should be placed in the web.config file.

<requestLimits maxAllowedContentLength="30000000" />


This setting is not directly available from IIS manager, so if you need to change this using GUI tool you can download IIS 7.0 Admin Pack. You will find this setting from selecting your website and then going to Request Filtering –> Edit Feature Settings –> Maximum allowed content length (Bytes).

Sunday, March 06, 2011

ThreadAbortException:Thread was being aborted in IIS 7

Recently i was developing a WCF web service in IIS 7 on Windows Server 2008 and started getting this exception quite weirdly. Weirdly in the sense that the exception was not consistently being reported at the same call stack.

My web service was using App_Data to store some application specific data which was also being added/modified/deleted during runtime.

After doing a lot of searching and study, the behavior of writing to the App_Data turned out to be the culprit. It is really hard to guess what may be wrong. In fact, I learnt that heavily modifying application subdirectory shuts down the appdomain.

Following are two references that explain this thing -

It seems that it has nothing to do with IIS 7 though and can happen even with IIS 6.