Gokul's Blog

An Interesting Exception while working with Collections

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I wanted to remove a set of items from a collection.

Tried to achieve it by using

foreach(var item in myObjCollection)

But the above statement will throw an Exception  saying that the container cannot be modified while enumerating.

I tried to remove the item from collection as follows:

for (int i = 0; i < myObjCollection.Count; ++i) {

.csharpcode, .csharpcode pre
font-size: small;
color: black;
font-family: consolas, “Courier New”, courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
background-color: #f4f4f4;
width: 100%;
margin: 0em;
.csharpcode .lnum { color: #606060; }


Do you think the above statement will work?

The above for statement also throws the same exception.

The resolution to the above problem are

  1. To call myCollection.RemoveAt(0) all the time
  2. Iterate in the reverse order (Starting from myCollection.Count() –1 to 0)

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