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copied!<p>In terms of performance, there is no real difference; field initializers are implemented as constructor logic. The only difference is that field initializers happen before any "base"/"this" constructor.</p> <p>The constructor approach can be used with auto-implemented properties (field initializers cannot) - i.e.</p> <pre><code>[DefaultValue("")] public string Foo {get;set;} public Bar() { // ctor Foo = ""; } </code></pre> <p>Other than that, I tend to prefer the field initializer syntax; I find it keeps things localized - i.e.</p> <pre><code>private readonly List<SomeClass> items = new List<SomeClass>(); public List<SomeClass> Items {get {return items;}} </code></pre> <p>I don't have to go hunting up and down to find where it is assigned...</p> <p>The obvious exception is where you need to perform complex logic or deal with constructor parameters - in which case constructor-based initialization is the way to go. Likewise, if you have multiple constructors, it would be preferable for the fields to always get set the same way - so you might have ctors like:</p> <pre><code>public Bar() : this("") {} public Bar(string foo) {Foo = foo;} </code></pre> <p>edit: as a side comment, note that in the above, if there are other fields (not shown) with field initializers, then they are only directly initialized in the constructors that call <code>base(...)</code> - i.e. the <code>public Bar(string foo)</code> ctor. The other constructor does <em>not</em> run field initializers, since it knows they are done by the <code>this(...)</code> ctor.</p>

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