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To deal with type-safe objects, Java Generics was first introduced. It stabilizes the code. Java Generics classes and methods give programmers access to a single method declaration, a group of related types, and a group of related methods. Additionally, generics offer compile-time type safety, enabling programmers to identify erroneous types at the compile stage. Types with parameters are generic. By utilizing generics, it is possible to design classes that interact with several data types, including Integer, String, and user-defined datatypes. The error: “The generic type already contains a definition” is a common error that can show up in many ways. In this blog, we will go through some of the ways you can fix this issue. Read on.
When Do You Encounter The Error: “The generic type already contains a definition”?
When attempting to define the Pair<A, B> class in C#, you may encounter a compiler error. This compiler problem is error CS0102: The type ‘Pair’ already contains a definition for ‘A’ in C#.
error CS0102: The type 'Pair<A, B>' already contains a definition for 'A'
error CS0102: The type 'Pair<A, B>' already contains a definition for 'B'
How To Solve The Error: “The generic type already contains a definition”?
Approach: According to their document
According to their document:
In most circumstances, type parameters have illustrative names that inform the reader of the connection between the type parameter and the generic type or function which it is used in, for instance Element in Array (Element), Key and Value in Dictionary (Key, Value). However, it is customary to label them using single letters like T, U and V, for example T in the function of swapTwoValues(_:_:) mentioned above, when there is no significant relationship between them.
The name of a type parameter in a class declaration’s type_parameter_list must be distinct from the names of all other type parameters in the similar type_parameter_list, as well as the name of the class with all its members.
Similarly, a type parameter with the same name as another type parameter or a class member is not possible. There is an A type argument and an A property in this example. The error message becomes obvious in this case.
class Broken<T>
{
public string T { get; set; }
}
Conclusion
We hope that you will enjoy our article about the error. With this knowledge, we know that you can fix your error: “The generic type already contains a definition” quickly by following these steps! If you still have any other questions about fixing this syntax error, please leave a comment below. Thank you for reading!
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