Templates c sharp

We can use the default keyword to set a generic parameter to its default value. In the example above, we tell the compiler to give the generic method a default value according to its type. In the example above, we told the compiler to check if the type of T is a value type struct. Because int is a value type, it will work fine. However, string is not a value type so the compiler will raise an error. If we changed the struct value types to class reference types , the compiler will be happy with string, but complain about int.

What constraints, if any, to apply to the type parameters See Constraints on Type Parameters. A good rule is to apply the maximum constraints possible that will still let you handle the types you must handle. For example, if you know that your generic class is intended for use only with reference types, apply the class constraint.

That will prevent unintended use of your class with value types, and will enable you to use the as operator on T , and check for null values. Because generic classes can serve as base classes, the same design considerations apply here as with non-generic classes.

See the rules about inheriting from generic base classes later in this topic. For an example of a simple generic class, see Introduction to Generics. The rules for type parameters and constraints have several implications for generic class behavior, especially regarding inheritance and member accessibility.

Before proceeding, you should understand some terms. Browse Browse option helps to select the data source. Connection by Vendor Connection by Vendor joins to the data sources, sorted by a vendor.

Now, we see our report with our sleeted template. We use the template with the data source panel. Summary Thus, we learnt the templates contains the basic architecture of the report and also learnt its use.

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