#339 – Readonly Fields vs. Read-Only Properties

A read-only property in a class is similar to a readonly field.  Both expose a value that users of the class can read, but not write.

A readonly field is defined using the readonly modifier.  A read-only property is defined by including a get accessor for the property, but not a set accessor.

A readonly field can have only a single value, set either at the time that the field is declared, or in a constructor.  A read-only property returns a value that may be different each time the property is read.

Example of a readonly field:

        // Readonly field, initialized in constructor
        public readonly string OriginalName;

        public Dog(string name)
        {
            Name = name;

            // Set readonly field once, in the constructor
            OriginalName = name;
        }

Example of a read-only property:

        public string FormalName
        {
            get
            {
                return string.Format("Sir {0}", Name);
            }
        }
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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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