Custome Control Problem

Muhammad Gouda

I am creating a Custom Server Control, where one of the properties should be the data type of another property for example: for an instance x of my control, I need the user of my control to be able to write something like:

x.property1 = "abc";
x.property1Type = System.String;

So, how to define property1Type within the class

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Abhijit Jana

Best way to do it using Generic in C#

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Muhammad Gouda

I am familiar with Generic BUT, I can not create a custome control from a generic class (I think)

foreach(Minute m in MyLife) myExperience++;

Abhijit Jana

Mohammed Gouda wrote:

BUT, I can not create a custome control from a generic class (I think)

why ? you can create separate class and create object of that class and pass the value and data type.

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N a v a n e e t h

AFAIK, you can't use generics here as you won't be able to view this control in the designer if you have a generic type with your class declaration. But you could do something like this

class YourClass
{
public Type Property1Type { get; set; }

    object property1;
    public object Property1 
    {
        get { return property1; }
        set
        {
            if (value.GetType() == this.Property1Type)
                property1 = value;
            else
                throw new Exception("Invalid type");
        }
    }
}

YourClass a = new YourClass();
a.Property1Type = typeof(System.String);
a.Property1 = "Hello";

Above code allows to set only the specified type to "Property1". I am not sure this is the correct approach though. If you could tell me why you need this, there may be better ways to do this. If you don't want designer support for this control you can use generic parameter with the class declaration. Then the code will be pretty nice.

class YourClassInGenerics<Property1Type>
{
public Property1Type Property1 { get; set; }
}

YourClassInGenerics<string> yourClass = new YourClassInGenerics<string>();
yourClass.Property1 = "Hello";

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N a v a n e e t h

Abhijit Jana wrote:

why ?

Creating generic control classes won't get designer support as designer don't know which type to be specified. If there is no designer support required, I believe it is possible.

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Abhijit Jana

Thanks for Correcting Me !!!

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N a v a n e e t h

You are welcome :)

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Abhijit Jana

did you check my recent article ?

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Muhammad Gouda

Thanks to all participants I got a safe solution Instead of Generic or unknown datatype. I created an abstract class from which I inherited all other classes of which objects may be bound to my new datasource It works well :-\

foreach(Minute m in MyLife) myExperience++;

Muhammad Gouda

Thanks for good effort

N a v a n e e t h wrote:

If you could tell me why you need this, there may be better ways to do this.

Exactly, I want to bind business objects to TreeView which does not support this sort of binding. So, I created my own datasource which is supposed to support a variety of business objects I got a safe solution Instead of Generic or unknown datatype. I created an abstract class from which I inherited all other classes of which objects may be bound to my new datasource It works well

N a v a n e e t h wrote:

If you don't want designer support for this control you can use generic parameter with the class declaration. Then the code will be pretty nice.

Yes, I need a designer support However, Thanks N a v a n e e t h for your great help. You are one of the best of CP :-D

foreach(Minute m in MyLife) myExperience++;

N a v a n e e t h

Mohammed Gouda wrote:

I created an abstract class from which I inherited all other classes of which objects may be bound to my new datasource

Good. Is this abstract class has some default functionality ? or it is just acting as a base class ? If it is acting as a base class, you should consider moving to an interface. Controls like GridView/Repeater supports data binding objects which has IEnumerable implemented. Your control also could do something similar.

Mohammed Gouda wrote:

You are one of the best of CP

Thanks. I am delighted :)

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Muhammad Gouda

N a v a n e e t h wrote:

Controls like GridView/Repeater supports data binding objects which has IEnumerable implemented. Your control also could do something similar.

Yes, My class alreay implement IHierarchicalEnumerable cause I deal with TreeView control. Thanks for the hint

foreach(Minute m in MyLife) myExperience++;