How to to Use Reflection in C# to Execute Method by name?

Question

I Want to use Reflection to execute my function(Which name is GetAverage,With no parameter) And this function is in class by name of Gold.

I Use This Code :

string MyFunction = "GetAverages";
Type type = typeof(MyGoldClass);
MethodInfo info = type.GetMethod(MyFunction);
int res = (int)info.Invoke(type,null);
res += 3;

But it do not work and Make instance Error Which i do not know what that is. ATTENTION MyFunction Is a Public Function In Gold Class.And i Want Calling and executing This in Other C# Page.

is GetAverages a static method ? if not you need to make a instance of your object first — Micah Armantrout, Sep 13 '13 at 17:50
Also...Is it called GetAverage or GetAverages? There seems to be an inconsistency in your post. — Giannis Paraskevopoulos, Sep 13 '13 at 17:53

Sriram Sakthivel · Answer 1 · 2013-09-13T17:57:00.840

2

If your method is static try this

int res = (int)info.Invoke(null, null);

If it is instance method try this

int res = (int)info.Invoke(instanceOfMyGoldClass, null);

where instanceOfMyGoldClass is a valid instancce of MyGoldClass

Refer msdn for more info

If this doesn't help post your method definition/signature. I'll update my answer accordingly.

edited Sep 13 '13 at 17:57

answered Sep 13 '13 at 17:50

Sriram Sakthivel

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score 1 · Accepted Answer · answered Sep 13 '13 at 17:50

1

string MyFunction = "GetAverages";
MethodInfo mi;

mi = typeof(MyGoldClass).GetMethod(MyFunction);
int res = (int)mi.Invoke(new MyGoldClass(), null);

answered Sep 13 '13 at 17:50

Giannis Paraskevopoulos

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score 0 · Answer 3 · answered Sep 13 '13 at 17:53

0

Assuming your method is public:

string MyFunction = "GetAverages";
Type type = typeof(MyGoldClass);
MethodInfo info = type.GetMethod(MyFunction);
int res = (int)info.Invoke(new MyGoldClass(), null);
res += 3;

Take a look at MethodInfo.Invoke

answered Sep 13 '13 at 17:53

Alessandro D'Andria

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score 0 · Answer 4 · answered Sep 13 '13 at 17:54

the Invoke method takes 2 parameters

1st-the object on which the method should be invoked

2nd-the arguments passed to the method

if the method is "static", it can not be called using an object so use

int res=(int)info.Invoke(null,null);

if the method is non-static, an object of MyGoldClass should be passed to invoke the method so use

int res=(int)info.Invoke(new MyGoldClass(),null);

How to to Use Reflection in C# to Execute Method by name?

4 Answers4