How Does C# Handle Object Passing: Pass-by-Value or Pass-by-Reference?

In -depth understanding of the object in C#

Generally, the variables of the original type of C# in C# are passed by reference, and the value of the original type is passed by value. However, when processing a reference type object like System.drawing.image, an exception will occur.

The abnormal behavior of the IMAGE object

When passing the IMAGE object to the method, the changes made in this method will not be reflected in the original object after the method is returned. This deviates from the expected quoting semantics.

The truth of the value transmitted

The opposite of general cognition, the object itself is not directly passed. Instead, their values ​​will be evaluated and passed as the initial parameters of the method. For the reference type, this value is a reference to the existing object. The modification of the object will be visible to the caller.

However, the parameter references to another object, which will not be reflected in the call method. This is because all the parameters are passed on by default.

Passing

To achieve real -reference transmission behavior, the REF or OUT keywords must be used. Whether the parameter type is valuable or reference type. These keywords ensure the value of the parameters and the storage position and the parameter sharing. Therefore, the modification of the parameters will be observed by the call method. In short, although the reference type object was originally passed on the value, their references can be modified, and the changes made by the reference object will be visible to the call. However, the assignment of the new object is assigned to the parameter will not spread the callback method. To achieve real -reference transmission behavior, Ref or OUT must be explicitly used.

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