Cannot set/get values to IDictionary

Question

public sealed class KnowledgeBase
{
    public KnowledgeBase(string json)
    {
        KnowledgeBaseItemId = "109";
        Description = "description";
        Filename = "abc.txt";
        TagInfo.Add("tagid","tagname");

    }

    public string KnowledgeBaseItemId { get; set; }

    public string Description { get; set; }

    public string Filename { get; set; }

    public string FCKText { get; set; }

    public string DateCreated { get; set; }

    public IDictionary<string,string> TagInfo  { get; set; }

}

This is my code snippet. It sets and get values for KnowledgeBaseItemId, Description, Filename, and so on.

But it throws an exception, when I try to add/set values to IDictionary in this line

TagInfo.Add("tagid","tagname");.

Exception is:

Object reference not set to an instance of an object.

Please help me what I'm doing wrong. Thanks in Advance!

score 2 · Answer 1 · answered Aug 28 '15 at 16:49

2

Your TagInfo dictionary is not initialized.

add TagInfo=new Dictionary<string,strin>() before adding element.

answered Aug 28 '15 at 16:49

Eser

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Thanks for your quick response. But how to initialize that.? – Kishor Bikram Oli Aug 28 '15 at 16:50
@KishorBikramOli in the answer... – Eser Aug 28 '15 at 16:50
Ok let me test. Thanks again. Will surely vote up if it works. Cheers! – Kishor Bikram Oli Aug 28 '15 at 16:54

M.kazem Akhgary · Accepted Answer · 2015-08-28T16:51:17.820

1

assign default value using Auto-property initializer for C#6 or higher.

public IDictionary<string,string> TagInfo  { get; set; } = new Dictionary<string,string>();

edited Aug 28 '15 at 16:51

answered Aug 28 '15 at 16:50

M.kazem Akhgary

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Cannot set/get values to IDictionary

2 Answers2