Quick Answer
Custom Model Binders handle types that the default binder can't bind — enums from string aliases, comma-separated lists to arrays, complex query parameter formats, or binding from non-standard locations. Implement IModelBinder, return the constructed object, and register it with ModelBinderProviders in MVC options.
Answer
Custom Model Binding is used when default binding cannot map request data to models correctly.
Typical use cases:
Non-standard data formats.
Combining multiple values into a single complex object.
Parsing custom header or route patterns.
Implementing IModelBinder or using custom attributes provides full control over how request data is translated into .NET types.
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Verified Answer
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