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(BCS) and log information to a custom database exposed as an external list. Note that if you start to log to a list or to a BCS source, you ll start consuming sandbox resource points, but less points than exceptions are accounted for.
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Logging is most often used when your solutions are deployed to look at the application s behavioral history, even though the ULSViewer tool allows you to see the logging as it happens. To see your custom application in real time and step through the code to find the failing parts, debugging is extremely useful. Debugging is the most common way to find what s wrong with your code. Using the excellent debugging facilities in Visual Studio 2010, you can easily set a breakpoint in your code and run your application. When the breakpoint is reached, the execution is interrupted and you can step forward or inspect the values of objects and even change them. To debug a Web Part or any other piece of code, attach Visual Studio to a process on the server so that it can catch the debugging events. SharePoint normally uses the ASP.NET worker process to run the code. But sandboxed solutions are executed in their own process, and Feature receivers run in the SharePoint timer job process, which means that you might have to attach the debugger to other processes than Visual Studio by default attaches to.
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Attaching to processes The SharePoint Developer Tools for Visual Studio 2010 allows for easy debugging of Web Parts and other SharePoint solutions. When you press F5 or select Debug > Start Debugging, Visual Studio automatically attaches to the correct processes. The first thing Visual Studio does is verify that debugging is enabled on the web application; if it s not, you ll receive a prompt asking if you want to enable it, as shown in figure 8.5. Debugging is configured in the web.config file of the web application and when Visual Studio enables debugging, it changes three attributes in the file, as shown in table 8.1. These values can be changed manually as well. Remember to use this feature with caution in production environments because enabled debugging may slow down your application, and it will show detailed error messages to your users.
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Figure 8.5 The first time a solution is debugged in a new web application using Visual Studio, you re asked to enable the debugging.
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Table 8.1 The attributes used when changing to debug mode Attribute Description
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debug<configuration><system.web><compilation _ debug= true|false /> mode <configuration><system.web><customErrors _ mode= On|Off|RemoteOnly />
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When set to true, debugging mode is enabled on the web application. The default value is false. Sets the type of error page to use. The default value is On in SharePoint, which shows the SharePoint error page. When set to Off, it shows the default ASP .NET error page. If the value is RemoteOnly, then only local access to the site shows the ASP .NET default error page. Indicates whether the call stack of the error should be shown. The default value is false. To show the detailed error messages, this must be set to true.
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Callstack <configuration><SharePoint><SafeMode _ CallStack= true|false />
When customErrors is set to Off and the CallStack property is set to true in web.config, SharePoint will no longer show the friendly error message. It will instead show the ASP.NET error page, also known as the Yellow Screen of Death. This error page shows the exact exception and the call stack of the failing component, and you ll find it useful when troubleshooting Web Parts or other components. Another way to start debugging is to attach to the processes manually. Use this approach if you d like to debug an already running session. The SharePoint web application processes run in the standard ASP.NET worker w3wp.exe processes. To attach to a process using Visual Studio, select Debug > Attach To Process. Be sure that the Show Processes From All Users and Show Processes In All Sessions options are checked. Then select the w3wp.exe process to attach to and click Attach. There might be several w3wp.exe processes, and you can safely attach to all of them. Or you can use the IIS management console to find the process id of the application pool and then select the correct process.
If you need to retrieve detailed information about errors, such as line numbers and filenames in the production environment, distribute your code using debug built files. You should never use debug builds in production unless necessary.
Debugging sandboxed solutions Sandboxed solutions aren t executed in the ASP.NET worker process w3wp.exe. Instead, they re executed in the special SharePoint Sandbox Code Service. Visual Studio is aware of this, and if you press F5 to run and debug your sandboxed solution, Visual Studio attaches to the correct process. The process that s used is named
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