Code inspection: Possible 'System.InvalidCastException'

This inspection reports an explicit cast that can fail at runtime with InvalidCastException.

Example

            using System;
            static void Handle(object value)
            {
                if (value is Action<string>)
                {
                    var action = (Action<int>)value;
                }
            }
        

The type check proves that value is Action<string>, so casting it to Action<int> is not safe.

How to fix it

There is no dedicated quick-fix for this inspection. A typical fix is to cast to the type you actually checked for, or use pattern matching.

            using System;
            static void Handle(object value)
            {
                if (value is Action<string> action)
                {
                    action("text");
                }
            }
        

01 April 2026