How Can I Programmatically Set Default Values for Properties During Reflection?

Equivalent of default value for setting property in reflection

When operating object properties through reflection, you need to set default values ​​for different data types. This article explores programming alternatives to simplify this process, rather than manually handling default values ​​for each type.

Question:

This question seeks a programmatic way to assign default values ​​to properties during a reflection loop without explicitly using the type-specific default keyword.

Answer:

Two solutions are provided:

1. Value type:

   • Use Activator.CreateInstance to instantiate a new default instance of the value type.

2. Reference type:

   • For reference types, just return null as they default to null.

Code example:

The following code snippet illustrates the implementation of this solution:

public static object GetDefault(Type type)
{
   if (type.GetTypeInfo().IsValueType)
   {
      return Activator.CreateInstance(type);
   }
   return null;
}

Note:

For compatibility with newer versions of .NET (such as .NET Standard), type.IsValueType should be replaced with type.GetTypeInfo().IsValueType.

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