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copied!<p>Properties cannot be passed by reference. Here are a few ways you can work around this limitation.</p> <h2>1. Return Value</h2> <pre><code>string GetString(string input, string output) { if (!string.IsNullOrEmpty(input)) { return input; } return output; } void Main() { var person = new Person(); person.Name = GetString("test", person.Name); Debug.Assert(person.Name == "test"); } </code></pre> <h2>2. Delegate</h2> <pre><code>void GetString(string input, Action<string> setOutput) { if (!string.IsNullOrEmpty(input)) { setOutput(input); } } void Main() { var person = new Person(); GetString("test", value => person.Name = value); Debug.Assert(person.Name == "test"); } </code></pre> <h2>3. LINQ Expression</h2> <pre><code>void GetString<T>(string input, T target, Expression<Func<T, string>> outExpr) { if (!string.IsNullOrEmpty(input)) { var expr = (MemberExpression) outExpr.Body; var prop = (PropertyInfo) expr.Member; prop.SetValue(target, input, null); } } void Main() { var person = new Person(); GetString("test", person, x => x.Name); Debug.Assert(person.Name == "test"); } </code></pre> <h2>4. Reflection</h2> <pre><code>void GetString(string input, object target, string propertyName) { if (!string.IsNullOrEmpty(input)) { prop = target.GetType().GetProperty(propertyName); prop.SetValue(target, input); } } void Main() { var person = new Person(); GetString("test", person, nameof(Person.Name)); Debug.Assert(person.Name == "test"); } </code></pre>

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