Is there any way to get the original name of the variable/argument, as it was named, in the caller method? In a way, it's like [CallerMemberName] attribute, but for the variable/argument.
Short example:
int ComplexMathMethod(int startPos, int endPos,
int backgroundStartPos, int backgroundEndStart,
int squareStartPos, // …and other positions… )
{
CheckPosition(startPos);
CheckPosition(endPos);
CheckPosition(backgroundStartPos);
CheckPosition(backgroundEndStart);
CheckPosition(squareStartPos);
// …and so on…
}
void CheckPosition(int position)
{
bool isValidPosition = // complex check;
if (!isValidPosition)
{
throw new ArgumentException(nameof(position));
// --->>> It will be extremely convenient to automatically replace "nameof(position)" with original
// name of variable/argument from caller method, like: "startPos", "endPos", "backgroundStartPos", etc.
// Additional string argument with original variable name is not a good solution too.
// Because, I have similar "check" method that checks 4 connected position’s integers at once.
// Therefore, 4 input ints with additional +4 string arguments will make a mess.
}
}
Long example:
void ShowMessage(string messageStr)
{
// Problem: get original variable/argument name, as it was called, in the caller method.
string callerMethodArgName;
// If method was called from "Main" method, than callerMethodArgName should equal to "finishMsg".
// If method was called from "DoWork" method, than callerMethodArgName should equal to "taskName".
// If method was called from "StartProgram" method, than callerMethodArgName should equal to "startingMsg".
// …missing logic, reflection code, etc.
// The next line is just a stub.
callerMethodArgName = nameof(messageStr);
Console.WriteLine($"Variable name is \"{callerMethodArgName}\"; value is \"{messageStr}\".");
}
void Main()
{
StartProgram();
DoWork("Programming…");
// Example 1.
string finishMsg = "Finish!";
ShowMessage(finishMsg);
}
// Example, caller method 2.
void StartProgram()
{
string startingMsg = "Starting program";
ShowMessage(startingMsg);
}
// Example, caller method 3.
void DoWork(string taskName)
{
ShowMessage(taskName);
}
Current program output:
// Variable name is "messageStr"; value is "Starting program".
// Variable name is "messageStr"; value is "Programming…".
// Variable name is "messageStr"; value is "Finish!".
Required/desired output:
// Variable name is "startingMsg"; value is "Starting program".
// Variable name is "taskName"; value is "Programming…".
// Variable name is "finishMsg"; value is "Finish!".
I am not sure if this is possible at all. I spent several hours playing with reflection, but unfortunately, it was fruitless. This would be extremely convenient while debugging in real project.
I will be grateful if someone can give a more accurate headline for this question. Thanks in advance!
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