How Can I Get A Class Object From Its Name Stored In A String

Question

1.00/5 (1 vote)

See more:

Dear All,

I am facing some silly problem about getting class type using its name stored in a string.

Here is my Case:

I have a HR project Consists of the Following:

1- HR.Core Class Library Project which contains my classes (Employee, Department, ....)
2- HR.Domain .....
3- HR.Repository .....
.....
4- HRApp which is the web application that contains my views, models and cotrollers and this project contains a reference of the other projects.

------------------------
Now in HRApp i want to get Employee Class using its Name which is stored in a string.

I tried Type.GetType("HR.Core.Employee")
But it always returns null.
------------------------

Notice that if i put the same code inside the HR.Core project in some kind mehtod called test, it works successfully.

Can any one tell me whats wrong?

Posted 15-Dec-15 20:47pm

_ProgProg_

Updated 16-Dec-15 1:04am

F-ES Sitecore

v2

Add a Solution

Comments

Sergey Alexandrovich Kryukov 16-Dec-15 2:59am

First of all, why?
In what assembly did you call Type.GetType?
The problem is pretty simple, but more important thing is: getting any type by its name is a pretty bad idea; the compiler cannot give you any error/warning if the name is wrong.
—SA

_ProgProg_ 16-Dec-15 3:03am

Actually i am trying to make a method which takes the class name as a string and getting its type for some long logic.
If you want i can explain it.

Sergey Alexandrovich Kryukov 16-Dec-15 11:03am

You did not answer the question about assembly. The type with the type name you are trying to get, is it the type of the same assembly? Is it a file of some assembly already loaded in current process?
—SA

_ProgProg_ 16-Dec-15 3:12am

Okay Let me explain my case to you:

I am using entity framework Code First.

Employee Class which is in [HR.Core] Maps a DB Table called Employee and i am already defines its attributes like required, stringlength[200] , ......

Now I want the Employee Model Class [In HRApp] properties attributes to be with the same properties attributes of Employee Core Class without the need to define these attributes on the Employee Model class's properties directly and that is the point. Alot of times it happens that i am forgetting attributes or changing attributes values between Employee Core Class And Employee Model Class.

For Example:

Employee Name Property String Length in Employee Core Class is 200 and in Employee Model Class it is 500. (An Exception Is Thrown as i am trying to store 500 characters in 200 characters column).

So i thought about inheriting Employee Core Class properties attributes to be in Employee Model Class properties Attributes.

i have implemented a custom validation class which named CustomRequired will take for example the class name and property name as strings and these property will be required if the employee class mapped property is required.

Now i am ready to add the [CustomRequired("ClassName", "PropertyName")] attribute on any Model property which will make it required if the mapped one is required also.

Now I hope i have explained my point of view clearly

_ProgProg_ 16-Dec-15 6:43am

@Sergey Alexandrovich Kryukov
Any Ideas??

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

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

F-ES Sitecore · Accepted Answer · 2015-12-16T01:10:00

When using GetType by name you need to give a fuller qualified name.

GetType("MyNamespace.MyClass, MyAssembly")

So

GetType("HR.Core.Employee, HR.Core")

above I am assuming the Employee class is an assembly called HR.Core, but it might not be. Example the project properties of the Core project and it will say what the assembly is called.

However in general it seems you're probably taking the wrong approach. Writing lose code like this to get around you forgetting to do things is rarely a proper solution.