Run Time error in System.ComponentModel

Question

Hi Team,

I see below exception in System.ComponentModel... Would you please help me to understand more on this

Answer 1

a type can have multiple attributes of many types. you are try to cast an arbitrary attributes to one specific one (System.ComponentModel.TypeDescriptionProviderAttribute). in your case none of the attributes are this type. you need to test the attribute type before casting or use the handy as type (which return null if not a match).

Answer 2

Hi @Earth_2
Based on the error message you gave, this is a type conversion issue.
The first thing you can use is to check if the object is compatible with a given type, and if it is compatible, it returns true, otherwise it returns false and no exception is thrown. Before type conversion, you can use is to determine whether the object is compatible with a given type, and if so, then convert. For example:

string str="test";  
object obj=str;  
if(obj is string){string str2=(string)obj};  

Secondly, we can use as: for conversion between reference types, direct conversion, if the conversion is successful, it will return the converted object, if the conversion fails, return null, and do not throw an exception. For example:

string str="test";  
object obj=str;  
string str2=obj as string;  
if(str2!=null){return "success"}  

If you can share a little bit of the other code, I think I can pinpoint the problem more precisely.

Best Regards
Qi You

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