Error in Class Module References

Question

1.00/5 (1 vote)

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I'm not able to use:

if (this.OpenConnection() == true) (I'm using public static bool for this line and using private bool for OpenConnection)

in my Class Module in visual studio using C# language. It says

"Keyword "this" is not valid in a static property, static method, or static field initializer"

OpenConnection itself is located in the same class module.

Posted 1-May-15 4:17am

JeremiasR

Updated 1-May-15 4:22am

v2

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-05-01T05:17:00

Solution 2

What is unclear in this error message? It could be unclear only if you don't understand what static means.

Please see my past answers:
Type casting in c#[^],
C# windows base this key word related and its uses in the application[^],
What makes static methods accessible?[^].

—SA

Posted 1-May-15 5:17am

Sergey Alexandrovich Kryukov

Thomas Daniels · Accepted Answer · 2015-05-01T04:26:00

Solution 1

You cannot call this in a static method because this refers to the current class instance, and a static method is not associated with an instance.

There are two possible solutions; what's the best, depends on your application:

Make OpenConnection static, and call it like a static method.
Make the caller an instance method.

Posted 1-May-15 4:26am

Thomas Daniels

Comments

Sergey Alexandrovich Kryukov 1-May-15 11:19am

Basically, it's correct (I voted 4), but it does not touch root of the problem: understanding what is "static". Decisions on what to make static and what instance should not be a free choice. In each case, it should be one and only one, correct decision.

Please see my answer.

—SA