problem disposing class in Dictionary it is Still in the heap memory although using GC.Collect RRS feed

  • Question

  • Hello

    i have a problem disposing class in Dictionary

    this is my code

     private Dictionary<string, MyProcessor> Processors = new Dictionary<string, MyProcessor>();
        private void button1_Click(object sender, EventArgs e)
          if (!Processors.ContainsKey(textBox1.Text))
            Processors.Add(textBox1.Text, new MyProcessor());
        private void button2_Click(object sender, EventArgs e)
          MyProcessor currnt_processor = Processors[textBox2.Text];
          currnt_processor = null;
     public class MyProcessor: IDisposable
        private bool isDisposed = false;
        string x = "";
        public MyProcessor()
          for (int i = 0; i < 20000; i++)
          //this line only to increase the memory usage to know if the class is dispose or not
            x = x + "gggggggggggg";  
        public void Dispose()
        public  void Dispose(bool disposing)
          if (!this.isDisposed)
            isDisposed = true;


    i use "ANTS Memory Profiler" to monitor heap memory

    the disposing work only when i remove all keys from dictionary

    how can i destroy the class from heap memory ?

    this a video link for the problem


    thanks in advance

    • Moved by Paul Zhou Thursday, January 20, 2011 7:42 AM CLR (From:Visual C# General)
    • Moved by Cookie Luo Thursday, January 20, 2011 7:48 AM (From:.NET Base Class Library)
    Saturday, January 15, 2011 12:07 PM

All replies

  • Have you disabled string interning?
    Sunday, January 16, 2011 9:30 PM
  • Hi,

      I think there are something else  using it when removed one object ,though it looks being released.When the dictionary is empty,the objects are really released.Furthermore,the type of string has a issue that it can lingering in the memory.You can try the other types.

    Tuesday, January 18, 2011 2:57 AM
  • Hi Bahgat,


    Based on your description, it’s a problem related to CLR forum. This forum is dedicated to C# technology. I'm moving this thread from Base "Visual C# General" to “CLR " forum, since this issue is related to CLR.There are more experts in that forum.


    Thank you for your posting and understanding.

    Paul Zhou [MSFT]
    MSDN Community Support | Feedback to us
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    Please remember to mark the replies as answers if they help and unmark them if they provide no help.

    Thursday, January 20, 2011 7:40 AM