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IL Emit call a generic type constructor?


IL Emit call a generic type constructor?

By : Charanjit Nanda
Date : November 17 2020, 04:28 AM
This might help you I'm trying to create a new List<> object in a dynamic method using Emit: ,
code :
// - Calling the base constructor
ilGen.Emit(OpCodes.Call, constructorInfo);


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How do I call a constructor on a generic type within a function of a base type without its own constructor?

How do I call a constructor on a generic type within a function of a base type without its own constructor?


By : Bob
Date : March 29 2020, 07:55 AM
Does that help I thought a great way to test my understanding of generic functions would be to create a function that would spit out a hex representation of a hash using one of the classes that inherits from HashAlgorithm. Since all of the HashAlgorithm classes offer ComputeHash, I thought this would be simple. When I construct such a function. though, I get an error because HashAlgorithm itself doesn't offer a constructor. I couldn't find any sort of interface or subclass of HashAlgorithm that does offer a constructor, either. If not all HashAlgorithm classes are required to support a constructor, is there some additional constraint I can put on a generic type to ensure a type offers an empty constructor or will I be forced to create an overload for each of the HashAlgorithm classes I know offer an empty constructor. , Try adding the new() clause to the end of your generic constraints:
code :
public static string GetHexHash<HashAlgorithmToUse>(Stream dataStreamToHash)
    where HashAlgorithmToUse : HashAlgorithm, new()
Reflection.Emit Generic Base Class Generic Method Call

Reflection.Emit Generic Base Class Generic Method Call


By : Greg Wiley
Date : March 29 2020, 07:55 AM
Any of those help I'm dynamically sub classing a generic type (filling it's contract) that has a generic method. I attempt to call this generic method but the assembly I produce has errors. Reflector crashes when trying to open the assembly and this code snippet does not run. , Instead of:
code :
var testGeneric = testClass
    .GetMethod("TestMethod")
    .MakeGenericMethod(typeof(int));
var testGeneric = testClassOfObject
    .GetMethod("TestMethod")
    .MakeGenericMethod(typeof(int));
How can I emit a call to a delegate whose type is unfinished at the time of the emit?

How can I emit a call to a delegate whose type is unfinished at the time of the emit?


By : nesa
Date : March 29 2020, 07:55 AM
this one helps. That's a tricky problem. I think that you should be able to use TypeBuilder.GetMethod to get the MethodInfo you need, using a call along the lines of
code :
TypeBuilder.GetMethod(directReadAccessorType, 
    typeof(DirectReadAccessor<>).GetMethod("Invoke"));
Get class from Type with Reflection and call a generic constructor with Type in C#

Get class from Type with Reflection and call a generic constructor with Type in C#


By : Siddhesh Adarkar
Date : March 29 2020, 07:55 AM
To fix this issue I am working with Dapper and I want to iterate through my model classes and set type mapping for any class having a field decorated with a ColumnAttribute. , You will need the method Type.MakeGenericType; usage is as follows:
code :
var columnType = typeof(ColumnAttributeTypeMapper<>);
var genericColumn = columnType.MakeGenericType(new[] {typeof(mappedType)});
var instance = Activator.CreateInstance(genericColumn);
How to call constructor of generic type in class constructor

How to call constructor of generic type in class constructor


By : kejun
Date : March 29 2020, 07:55 AM
wish of those help There's no way to check if a class has a default constructor in compile time. I would solve this problem by passing a factory that creates instances of the given type:
code :
class Matrix2D<T : Any> : Cloneable, Iterable<T> {
  private val array: Array<Array<Any>>

  constructor(rows: Int, columns: Int, default: T) :
      this(rows, columns, { default })

  constructor(rows: Int, columns: Int, factory: () -> T) {
    when {
      rows < 1 -> throw MatrixDimensionException("Number of rows should >= 1")
      columns < 1 -> throw MatrixDimensionException("Number of columns should be >= 1")
    }
    array = Array(rows) { Array<Any>(columns) { factory() } }
  }
}
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