Below are some differences of Direct casting vs 'as' operator?:-
See the below examples:-
void Handler(object o, EventArgs e)
// I swear o is a string
string s = (string)o; // 1
string s = o as string; // 2
string s = o.ToString(); // 3 3rd one is not a casting, but you get the an idea.
Below are line wise different:-
1. Throws InvalidCastException if o is not a string. Otherwise, assigns o to s, even if o is null.
2. Assigns null to s if o is not a string or if o is null. For this reason, you cannot use it with value types (the operator could never return null in that case). Otherwise, assigns o to s.
3. Causes a NullReferenceException of o is null. Assigns whatever o.ToString() returns to s, no matter what type o is.
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