如何获取asp.net core 6 web api中的Role Claims？

Question

I try to get RoleClaims from ASP.NET CORE Identity and my code is:

[HttpGet]
public async Task<IActionResult> GetAllRoleClaims(string email)
{
    var user = await _userManager.FindByEmailAsync(email);
    var role= await _userManager.GetRolesAsync(user);
    var roleclaim = await _roleManager.GetClaimsAsync(role);
   // var roleclaim = await _roleManager.GetClaimsAsync((IdentityRole)role);

    return Ok(roleclaim);
}

It give me the error:

cannot convert from 'System.Collections.Generic.IList' to 'Microsoft.AspNetCore.Identity.IdentityRole'

the Error is at this section:

var roleclaim = _roleManager.GetClaimsAsync(role);

The GetClaimsAsync(role) function does not accept the role and give the above error and when I use this var roleclaim = _roleManager.GetClaimsAsync((IdentityRole)role); for conversion it gives me another error at runtime:

Unable to cast object of type 'System.Collections.Generic.List`1[System.String]' to type 'Microsoft.AspNetCore.Identity.IdentityRole'.

Can anyone help me how to getRoleClaims from .net core Identity using roleManager ?

Answer 1

In your code,

var role= await _userManager.GetRolesAsync(user);

Returns a list of role names (strings), eg ["admin", "user"].

Now, use the role name (string) to get the role object if your user only has one role,

var role = await _roleManager.FindByNameAsync(role.First());

Then, pass the role to get the claims,

var roleclaim = _roleManager.GetClaimsAsync(role);

Answer 2

As per your scenario you can do as following: Therefore, it will return you the required claim.

[HttpGet]
public async Task<IActionResult> GetAllRoleClaims(string email)
{
    var user = await _userManager.FindByEmailAsync(email);

    var roleclaim = await _userManager.GetClaimsAsync(user);

    return Ok(roleclaim);
}

Note: If you want to get only single claim by given email, in this scenario its better to skip looping and above way would be efficient in regards of Big O .