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POWhy I can't add items to the Generic List with indexer?
 

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  1. POWhy I can't add items to the Generic List with indexer?
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    <p>Here is a strange situation I have seen today:</p> <p>I have a generic list and I want add items to my list with it's indexer like this:</p> <pre><code>List&lt;string&gt; myList = new List&lt;string&gt;(10); myList[0] = "bla bla bla..."; </code></pre> <p>When I try this, I'm getting <code>ArgumentOutOfRangeException</code></p> <p><img src="https://i.stack.imgur.com/Mkzf5.png" alt="enter image description here"></p> <p>Then I looked at <code>List&lt;T&gt;</code> indexer set method, and here it is:</p> <pre><code>[TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries"), __DynamicallyInvokable] set { if ((uint) index &gt;= (uint) this._size) ThrowHelper.ThrowArgumentOutOfRangeException(); //here is exception this._items[index] = value; ++this._version; } </code></pre> <p>And also looked at <code>Add</code> method:</p> <pre><code>[__DynamicallyInvokable] public void Add(T item) { if (this._size == this._items.Length) this.EnsureCapacity(this._size + 1); this._items[this._size++] = item; ++this._version; } </code></pre> <p>Now, as I see both methods are using the same way:</p> <pre><code>// Add() Method this._items[this._size++] = item; // Setter method this._items[index] = value; </code></pre> <p>The <code>_items</code> is an array of type <code>T</code> :</p> <pre><code>private T[] _items; </code></pre> <p>And in the constructor <code>_items</code> initialized like this:</p> <pre><code>this._items = new T[capacity] </code></pre> <p>Now, after all of these I'm curious about why I can't add items into my list with an index<br> ,although I specify list capacity explicitly? </p>
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    1. This table or related slice is empty.
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    1. USSelman Genç
    1. USSelman Genç
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      1. POWhy I can't add items to the Generic List with indexer?
      1. This table or related slice is empty.
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    2. VO
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      1. POWhy I can't add items to the Generic List with indexer?
      1. This table or related slice is empty.
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      1. POWhy I can't add items to the Generic List with indexer?
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    1. COThe indexer does NOT add items. You have an empty list and you are trying to access the (non-existent) first item
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      1. POWhy I can't add items to the Generic List with indexer?
      1. USPanagiotis Kanavos
 

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