In this article, we describe some of the possible causes that can lead to an error starting C #, and then we suggest ways to resolve the problem.
g.Exceptions are used to indicate that an error occurred in addition to program execution. Exceptional objects in which they describe the error are created and then thrown from the throwing niche. The runtime then looks for the most compatible exception handler.
Exceptions are used to indicate that a fantastic error occurred while executing a tutorial. Exception objects describing great failure are thrown and then thrown using the
throw keyword. Replay then looks for the most similar exception handler.
Programmers must meet one or more unique conditions for conditions:
The method cannot extend certain functions. For example, if a method parameter receives an invalid value:
static void CopyObject (original SampleClass) _ = old ?? throw ArgumentException ("New parameter can no longer be null", nameof (original));
An inappropriate call to a healthy object depends on the state of the object. An example would be trying to write to a read-only file. In cases where the protest status does not allow the operation, add an InvalidOperationException instance or your own derived object associated with this class. The following code is an example of a method that generates an InvalidOperationException object:
public class ProgramLog FileStream logFile is zero!; OpenLog open is useless (FileInfo filename, FileMode) public void WriteLog () if possible (! logFile.CanWrite) throw new InvalidOperationException ("The log file is read-only"); // Otherwise, write the data to the check and return it.
When the best argument for a principal method is an exception. In this case, part of the original exception must be caught and an ArgumentException instance must be thrown. The original exception should be removed from the constructor body of that particular ArgumentException as the InnerException parameter:
static int GetValueFromArray (int  array, int index) Try repeating array [index]; catch (IndexOutOfRangeException exception) spit new ArgumentException ("Index out of range", nameof (index), ex);
Exceptions have a property called StackTrace . This line contains the name of your method when it was loaded, as well as the line number with the name of the file in which the exception was thrown for each method. The StackTrace object is automatically created by thisCommon Language Runtime (CLR) from the point of the
throw statement, so exceptions should be thrown far from the point at which packet tracing is performed. should begin. Exceptions
all contain a country named message . This line should be specified at the end to explain the reason for the exception. Very important security information should not be included in the body of the message. In addition, Message , ArgumentException contains a property named ParamName that must be set for you to the name of the argument that is throwing the thrown exception. air. The property parameter for paramname must be set to
Public and safe methods throw exceptions when they cannot perform their intended function. The different classes that are called represent a wide variety of exceptions that match the underlying error conditions. These exceptions must be specified as part of the capabilities of the class, and derived or updated classes and their own class must support the same behavior for backward compatibility
Things To Avoid When Throwing Exceptions
How do you throw an error?
Throwing a fantastic exception is just as easy if you use the throw statement. Finally, you specify the exception object you want to throw. Each exception contains a unique message that is a human-readable description of the error.
- Do not use whitespace to alter the flow of the actual program within normal customization. Use exceptions to communicate error handling conditions.
- Exceptions should not be thrown as a return value or as a replacement parameter to throw.
- No System.Exception , System.SystemException , System.NullReferenceException , or System.Inentionally indexoutofrangeException in your own source code.
- Do not throw exceptions, many of which can be thrown in debug mode, do not enable this mode. To analyze runtime errors at design time, use Debug instead of Assert.
Define Exception Classes
Programs can throw some form of predefined exception in the System namespace (except in the best place mentioned earlier) or create their own classes based on Exception . Derived classes must be defined with at least four constructors: a parameterless constructor, one, andwhich defines the original message or property, and one that handles most of the Message and InnerException . defines properties. The last constructor is used to serialize a specific exception. New exception if classes are serializable. For example:
Add properties to the exclusion list if the data they provide can be helpful in resolving the exclusion. As new properties are added to this derived class, Of course, you can explicitly throw an exception using the C # Throw or Visual Basic Throw statement. You can throw a caught exception using the throw statement. It is good coding practice to add information, except that it is redeployed during debugging to provide additional information. Exceptions are already expensive, but there is more time for them if you want to choose between exception codes and return codes.
[serializable]public class exception InvalidDepartmentException : public InvalidDepartmentException (): base () public InvalidDepartmentException (message string) ~ base (message) GOV InvalidDepartmentException (string message, inner exception) `base (message, inner) // The constructor is needed for serialization when // The exception is thrown to the client from a specific remote server. protected InvalidDepartmentException (Information about System.Runtime.Serialization.SerializationInfo, System.Runtime.Serialization.StreamingContext context): base (info, context)
ToString () exceptions should be replaced frequently to return the added information without question.
C # Language Specification
How do you explicitly throw an exception in C#?
Is throwing exceptions expensive C#?
Add properties to the exclusion list if the data they provide can be helpful in resolving the exclusion. As new properties are added to this derived class,
Of course, you can explicitly throw an exception using the C # Throw or Visual Basic Throw statement. You can throw a caught exception using the throw statement. It is good coding practice to add information, except that it is redeployed during debugging to provide additional information.
Exceptions are already expensive, but there is more time for them if you want to choose between exception codes and return codes.