Creating Type from string

Question

1.00/5 (1 vote)

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For my persistence library I would like to create type dynamically.
Unfortunately I have a problem with generic types. The code below fails at runtime and I have no clue why:

C#

var tDict = Type.GetType("System.Collections.Generic.Dictionary`2[]");
var tDict2 = tDict.MakeGenericType(typeof(int), typeof(string));

The exception is:

InvalidOperationException:
Additional information: System.Collections.Generic.Dictionary`2[TKey,TValue][] is not a GenericTypeDefinition. MakeGenericType may only be called on a type for which Type.IsGenericTypeDefinition is true.

Posted 25-Nov-13 3:32am

Super Lloyd

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2 solutions

Solution 1

The following code makes the trick:

C#

private void test()
        {
            Type tDict = Type.GetType("System.Collections.Generic.Dictionary`2[System.Int32, System.String]").GetGenericTypeDefinition();

            var tDict3 = tDict.MakeGenericType(typeof(string), typeof(string));
            var tDict2 = tDict.MakeGenericType(typeof(int), typeof(string));

        }

Posted 25-Nov-13 3:53am

Adam Zgagacz

Comments

Super Lloyd 25-Nov-13 10:41am

Hi, I solved it myself! ;)
Beside I have a type name parser and need to resolve each piece independently, to repair broken Type.GetType(), so I can't use the full type name as above!

Adam Zgagacz 25-Nov-13 12:42pm

I see. good luck with the rest of your code.

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Super Lloyd · Accepted Answer · 2013-11-25T03:56:00

Solution 2

Solved!

var tDict = Type.GetType("System.Collections.Generic.Dictionary`2");

works!! :)

Posted 25-Nov-13 3:56am

Super Lloyd

Creating Type from string

2 solutions

Solution 1

Solution 2

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Creating Type from string

2 solutions

Solution 1

Solution 2

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