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In . NET we’ve got this cool little language construct called default, that’ll give you the default value for any given type.   That is, null, for any reference type, or zero/false/DateTime. Min/etc. for value types.

Here it is in action (nothing amazing going on here):

var x = default(DateTime);

So what if you don’t know the type you want the default of at compile time? You can’t say

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var y = default(today. GetType());

nor

var z = typeof(DateTime). GetDefault();

That last one would be nice, but that “GetDefault” method doesn’t exist.

I’ve seen several solutions to this, that are basically variations on this theme:

public static object GetDefaultValue(Type type)

{

    return type. IsValueType

        ? Activator. CreateInstance(type)

        : null;

}

 

This certainly works, but I somehow feel like it’s not exactly perfect since it doesn’t use the default operator.

Here is how I normally do it.   It sidesteps the IsValueType, and Activator stuff viagra discount uk, and uses the built-in default language construct… First it grabs a handle to the GetDefaultGeneric method, and then makes the generic version of it with the specific type. Viagra discount uk   then it calls it, returning the value.

public static object GetDefault(this Type type)

{

    var getDefault = typeof(ExtReflection)

                          . GetMethod("GetDefaultGeneric");

    var typed = getDefault. MakeGenericMethod(type);

 

    return typed. Invoke(null, new object[] { });

}

 

public static T GetDefaultGeneric<T>()

{

    return default(T);

}

 

Pretty simple, but something I’ve found useful every now and again.   I’d guess this technique could be useful in other situations/contexts as well.


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