When developing web-based applications in ASP.NET MVC, Data Annotation is used for data validation. The validation can be applied quickly using data annotation attribute classes over model classes. It is mainly used to attach controls to model properties or classes for data validation and sending messages to users. We will learn about ASP.NET MVC: Data Annotation Attributes and Why Do We Need in this blog. Join FITA Academy‘s MVC Course in Chennai, which offers advanced certification training and 100% job placement assistance.
Data Annotation Attributes in ASP.NET MVC
Here are the syntax for the various types of Data Annotations:
1) DataType
This attribute is used to specify the model’s data type.
Syntax
[DataType(DataType.Text)]
2) Required
This attribute designates a specific value as mandatory for a specific requirement.
Syntax
[Required(ErrorMessage=”Please enter your name”),MaxLength(87)]
3) String Length
We can set the minimum and maximum string ranges of the property using this annotation attribute.
Syntax
[StringLength(50,ErrorMessage=”Please do not enter values over 50 characters”)]
4) MaxLength
We can specify the maximum length of the property using this annotation attribute.
Syntax
[MaxLength(5)]
5) Range
To define the range between two numbers, we can use the Range annotation attribute.
Syntax
[Range(50,250,ErrorMessage=”Please enter the correct value”)]
6) Bind
This annotation attribute specifies which fields to include or exclude from model binding.
Syntax
[Bind(Exclude = “EmployeeID”)]
7) DisplayFormat
This annotation attribute allows us to specify the date format specified by the attribute.
Syntax
[DisplayFormat(DataFormatString = “{0:MM.DD.YYYY}”)]
8) Display Name
With this annotation attribute, we can specify which property names will be displayed in the view.
Syntax
[Display(Name=”Employee Name”)]
9) Regular Expression
We can use this attribute to specify a regex (regular expression) pattern for the property. For instance, email address.
Syntax
[RegularExpression(@”^\y+([-+.’]\y+)*@\y+([-.]\y+)*\.\y+([-.]\y+)*$”, ErrorMessage = “Your Email is not valid.”)]
10) Scaffold Column
When a class uses scaffolding or specifies a data column, it enables certain functionalities.
Syntax
[System.AttributeUsage(System.AttributeTargets.
Field | System.AttributeTargets.Property, AllowMultiple=false)]
In Data Annotations have two types of namespaces, each with its own built-in type.
System.ComponentModel. DataAnnotations incorporate the subsequent attributes that affect and check the size or nullability of the column.
- MinLength
- MaxLength
- StringLength
- Key
Check out our MVC Classes in Chennai to get professionally prepared.
System. ComponentModel. DataAnnotations. The schema namespace includes the following attributes that reshape the database schema.
Index
- ForeignKey
- NotMapped
- InverseProperty
Why Do We Need?
There are three types of data validations in ASP.NET MVC web applications:
Client-Side Validation:
- HTML validation
- JavaScript validation
Server-side Validation:
- ASP.NET MVC Model validation
- Database validation
ASP.NET MVC model validation offers superior security than HTML/JavaScript validation, which can pose risks and potentially fail if JavaScript is disabled during application runtime. The ASP.NET MVC Framework includes a framework called Data Annotation, which is used for data model validation. It comes from the System. Component Model. Data Annotations assembly. You can use Data Annotation to implement model validation and define model class properties.
We hope this blog helped you understand ASP.NET MVC: Data Annotation Attributes and Why Do We Need. In this blog, we discussed the concept of data annotation and its various types, as well as why we need them, which will be useful to professional developers from Java and.net backgrounds, application architectures, and other learners looking for information on JavaScript events. Join MVC Training in Chennai, which provides the best certification training with placement assistance.