I want to show Components in a tabs , so first of all create few components. In this project we have three components, First View Component public class AllViewComponent : ViewComponent { private readonly UserManager<ApplicationUser> _userManager; public AllViewComponent(UserManager<ApplicationUser> userManager) { _userManager = userManager; } public async Task<IViewComponentResult> InvokeAsync() { List<StudentViewModel> allUsers = new List<StudentViewModel>(); var items = await _userManager.Users.ToListAsync(); foreach (var item in items) { allUsers.Add(new StudentViewModel {Id=item.Id, EnrollmentNo = item.EnrollmentNo, FatherName = item.FatherName, Name = item.Name, Age = item.Age, Birthdate = item.Birthdate, Address = item.Address, Gender = item.Gender, Email = item.Email }); }
In C language, we know that all the variables should be declared before they are used. Pointer variable should also be declared before their use. The syntax to declare a pointer variable is shown below.
type * identifier;
Type : type can be any datatype such as int, float , char etc. It may be derived or user defined data type also.
* : The asterisk (*) in between type and identifier tells that the identifier is a pointer variable.
Identifier : Name given to the pointer variable.
Example -1 : Consider the following declaration:
int * p;
The above declaration can be read as "p is pointer to integer variable" and this declaration informs the following points:
type * identifier;
Type : type can be any datatype such as int, float , char etc. It may be derived or user defined data type also.
* : The asterisk (*) in between type and identifier tells that the identifier is a pointer variable.
Identifier : Name given to the pointer variable.
Example -1 : Consider the following declaration:
int * p;
The above declaration can be read as "p is pointer to integer variable" and this declaration informs the following points:
- The variable p is a pointer variable. So, it should contain the address of variable during execution.
- The type int refer to the type of the variable stored in pointer variable p i.e. the pointer variable p should contain address of an integer variable.
Example-2 : Consider the following declaration:
double *pd;
This declaration informs the compiler that pd is a pointer variable and can hold the address of a variable of type double.
double *pd;
This declaration informs the compiler that pd is a pointer variable and can hold the address of a variable of type double.
Example-3 : In the declaration, the position of * is immaterial. For example, all the following declaration are same:
int *pa;
int * pa;
int* pa;
Any of the above declaration informs that the variable pa is a pointer variable and it should contain address of integer variable.
Example-4 : Consider the multiple declaration as shown below:
int* pa,pb,pc;
Note : Here, we may wrongly assume that the variables pa, pb amd pc are pointer variables. This is because * is attached to int. This assumption is wrong. Only pa is a pointer variable, whereas the variables pb and pc are ordinary integer variables. For better readability, the above declaration can be written as shown below:
int *pa, pb, pc;
Now, we can easily say that pa is a pointer variable because of * operator, whereas pb and pc are integer variables and are not pointer variables. It is still better if the variable are declared in separated lines as shown below:
int *pa;
int pb;
int pc;
int *pa;
int * pa;
int* pa;
Any of the above declaration informs that the variable pa is a pointer variable and it should contain address of integer variable.
Example-4 : Consider the multiple declaration as shown below:
int* pa,pb,pc;
Note : Here, we may wrongly assume that the variables pa, pb amd pc are pointer variables. This is because * is attached to int. This assumption is wrong. Only pa is a pointer variable, whereas the variables pb and pc are ordinary integer variables. For better readability, the above declaration can be written as shown below:
int *pa, pb, pc;
Now, we can easily say that pa is a pointer variable because of * operator, whereas pb and pc are integer variables and are not pointer variables. It is still better if the variable are declared in separated lines as shown below:
int *pa;
int pb;
int pc;
Comments
Post a Comment