質問編集履歴
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コードに```を追記しました。
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@@ -22,44 +22,69 @@
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C#
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```
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using System;
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using System.Collections.Generic;
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public class Hello{
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public static void Main(){
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var value = new tekito2();
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value.Property2 = 20;
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}
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}
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public class tekito1{
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int c ;
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public int Property{
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get{
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return c;
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}
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set{
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c = value;
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}
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}
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}
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public class tekito2{
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tekito1 a ;
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public int Property2{
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get{
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return a.Property;
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}
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set{
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a.Property = value;
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}
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}
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}
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```
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### 発生したエラーの内容
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Unhandled Exception:
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System.NullReferenceException: Object reference not set to an instance of an object
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