[C#] set has been modified; Enumeration operations may not be performed.

The problem

An error was reported while performing a list removal operation with foreach

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code

Foreach (var item in list) {if (judge condition) {list.remove (item); }}Copy the code

To solve

Method 1: Use the for loop

for (int i = 0; i < list.Count; I ++) {if (judge condition) {list.removeat (I); i--; }}Copy the code

Method 2: Use ToArray method

Foreach (var item in list.toarray ()) {if (judge condition) {list.remove (item); }}Copy the code

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