Assign string to array of class type in c# [duplicate]

Question

I have one class where in I am defining 2 variables.

public class attachment_type
{
   string filename;
   int cnt;
}

In the 2nd class, I want to assign string value to filename. In already existing code they have made array of class type.

public class mainApp
{
   attachment_type[] at = new attachment_type[dt.rows.count];
   at[0].filename = "test File" 
}

I am not able to do the above. Error comes at line at[0].filename = "test File";

Object reference not set to an instance of object.

MakePeaceGreatAgain · Accepted Answer · 2015-12-16 08:14:19Z

3

You have to assign a new instance of your class for every entry in the array:

public class mainApp
{
    attachment_type[] at = new attachment_type[dt.rows.count];
    at[0] = new attachment_type();
    at[0].filename = "test File" 
}

With attachment_type[] at = new attachment_type[dt.rows.count]; you only allocate a new array of a given size, however the array does not have any content so far. You only say that you need some memory, but not for what.

answered Dec 16, 2015 at 8:14

MakePeaceGreatAgain

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