Handling Errors In MVC
var fileContents = "";
var physicalPath = Server.MapPath(dataFilePath);
var userMessage = "Hello world, the time is " + DateTime.Now;
var userErrMsg = "";
var errMsg = "";
if(IsPost)
{
// When the user clicks the "Open File" button and posts
// the page, try to open the created file for reading.
try {
// This code fails because of faulty path to the file.
fileContents = File.ReadAllText(@"K:\batafile.txt");
// This code works. To eliminate error on page,
// comment the above line of code and uncomment this one.
fileContents = File.ReadAllText(physicalPath);
}
catch (FileNotFoundException ex)
{
// You can use the exception object for debugging, logging, etc.errMsg = ex.Message;
// Create a friendly error message for users.
userErrMsg = "A file could not be opened, please contact "+ "your system administrator.";
}
catch (DirectoryNotFoundException ex)
{
// Similar to previous exception.
errMsg = ex.Message;
userErrMsg = "A directory was not found, please contact "+ "your system administrator.";
}
}
else
{
// The first time the page is requested, create the text file.
File.WriteAllText(physicalPath, userMessage);
}
}
<!DOCTYPE html>
<html lang="en">
<head><meta charset="utf-8" />
<title>Try-Catch Statements</title>
</head><body>
<form method="post" action="" >
<input type="submit" name="Submit" value="Open File"/>
</form>
<p>@fileContents</p>
<p>@userErrMsg</p>
</body>
</html>
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