What is the meaning of public string this[string columnName]
When implementing IDataErrorInfo interface?
public string this[string columnName]
{
get
{
switch (columnName)
{
case "Name":
return ValidateName();
case "PhoneNumber":
return ValidatePhoneNumber();
default:
return string.Empty;
}
}
}
I don't get it why there are square parentheses and what it does.
Answer: Thanks to Hans and Scott now I know that is simply the syntax of an indexer. More information here .
That is a C# indexer , it lets you use your class like
IDataErrorInfo myClass = new MyClass();
string phoneNumberErrorInfo = myClass["PhoneNumber"];`
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