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/checked (C# Compiler Options)

The /checked option specifies whether an integer arithmetic statement that results in a value that is outside the range of the data type, and that is not in the scope of a checked or unchecked keyword, causes a run-time exception.

/checked[+ | -]

An integer arithmetic statement that is in the scope of a checked or unchecked keyword is not subject to the effect of the /checked option.

If an integer arithmetic statement that is not in the scope of a checked or unchecked keyword results in a value outside the range of the data type, and /checked+ (/checked) is used in the compilation, that statement causes an exception at run time. If /checked- is used in the compilation, that statement does not cause an exception at run time.

The default value for this option is /checked-. One scenario for using /checked- is in building large applications. Sometimes automated tools are used to build such applications, and such a tool might automatically set /checked to +. You can override the tool's global default by specifying /checked-.

To set this compiler option in the Visual Studio development environment

  1. Open the project's Properties page. For more information, see Build Page, Project Designer (C#).

  2. Click the Build property page.

  3. Click the Advanced button.

  4. Modify the Check for arithmetic overflow/underflow property.

To access this compiler option programmatically, see CheckForOverflowUnderflow.

The following command compiles t2.cs. The use of /checked in the command specifies that any integer arithmetic statement in the file that is not in the scope of a checked or unchecked keyword, and that results in a value that is outside the range of the data type, causes an exception at run time.

csc t2.cs /checked
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