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The custom method for handling Golang errors is to create a custom error type and implement the error.Error interface. In practical cases, use a custom error handler to specify error information more specifically for easier debugging and handling.
#How to custom handle errors in Golang?
Golang provides built-in error handling mechanism, but sometimes you may need to customize error handling. This tutorial will teach you how to create custom error handlers and apply them in real-world use cases.
Custom error handler
To create a custom error handler, use the error.Error
interface. This interface accepts a string type error description as a parameter.
package myerrors import "fmt" type MyError struct { errorString string } func (e *MyError) Error() string { return e.errorString } func NewMyError(errorString string) error { return &MyError{errorString: errorString} }
NewMyError
The function returns a MyError
type that implements the error
interface. Error
The method returns an error description string.
Practical case: Validating user input
Suppose we have a function ValidateUserInput
, which validates user input and returns an error if the input is invalid.
package main import ( "fmt" "log" "myerrors" ) func ValidateUserInput(input string) error { if input == "" { return myerrors.NewMyError("输入为空") } if len(input) < 5 { return myerrors.NewMyError("输入长度太短") } return nil } func main() { input := "Golang" err := ValidateUserInput(input) if err != nil { log.Fatalf("输入验证失败: %v", err) } fmt.Println("输入已验证成功") }
In the ValidateUserInput
function, we create a custom error using the NewMyError
function. We then check for errors in the main
function and print the appropriate error message.
By using a custom error handler, we can specify error information more specifically, making it easier to debug and handle.
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