问题

[HttpGet("GetUsersListByRoleAsync")]
public async Task<ActionResult<IEnumerable<UserSimple>>> GetUsersListByRoleAsync(int roleId)
{
    try
    {
        IEnumerable<UserSimple> result = await aRepo.GetUsersListByRoleAsync(roleId);
        return Ok(result);
    }
    catch (Exception ex)
    {
        return BadRequest(ex.Message);
    }
}

public class UserSimple
{
    public int Id_User { get; set; }
    public string DomainName { get; set; }
}

async GetUsersListByRoleAsync(roleId: number): Promise<UserSimple[]> {
    const resp = await fetch(`api/Administration/GetUsersListByRoleAsync?roleId=${roleId}`, {credentials: "include"})

    if (resp.status >= 400)
        throw new Error(`[AdministrationDbHandler]: ${await resp.text()}`)

    const usersList = await resp.json() as UserSimple[]
    return usersList
}

export type UserSimple = {
    id_User: number
    domainName: string
}

问题是，后端调试时一切正常，但在前端，resp.json() as UserSimple[] 返回以下内容：

0: {}
length: 1
[[Prototype]]: Array(0)

因此，它具有所需数量的元素，但它们是空的。可能的问题是什么？

<details>
<summary>英文:</summary>

I am using React + C# for my website. I&#39;m trying to get some data from database, but seem to have some troubles. Here&#39;s the function in my controller:
```cs
[HttpGet(&quot;GetUsersListByRoleAsync&quot;)]
public async Task&lt;ActionResult&lt;IEnumerable&lt;UserSimple&gt;&gt;&gt; GetUsersListByRoleAsync(int roleId)
{
    try
    {
        IEnumerable&lt;UserSimple&gt; result = await aRepo.GetUsersListByRoleAsync(roleId);
        return Ok(result);
    }
    catch (Exception ex)
    {
        return BadRequest(ex.Message);
    }
}

UserSimple class:

public class UserSimple
{
    int Id_User { get; set; }
    string DomainName { get; set; }
}

Function in the frontend DbHandler:

async GetUsersListByRoleAsync(roleId: number): Promise<UserSimple[]> {
    const resp = await fetch(`api/Administration/GetUsersListByRoleAsync?roleId=${roleId}`, {credentials: "include"})

    if (resp.status >= 400)
        throw new Error(`[AdministrationDbHandler]: ${await resp.text()}`)

    const usersList = await resp.json() as UserSimple[]
    return usersList
}

UserSimple type in the frontend:

export type UserSimple = {
    id_User: number
    domainName: string
}

The thing is, while debugging in the backend everything is great, but in the frontend, resp.json() as UserSimple[] returns the following:

0: {}
length: 1
[[Prototype]]: Array(0)

So, it has the needed amount of elements, but they're empty. What can be the problem?

答案1

得分: 1

类 UserSimple 中的属性应该是公共的：

public class UserSimple
{
    public int Id_User { get; set; }
    public string DomainName { get; set; }
}

public class UserSimple
{
    public int Id_User { get; set; }
    public string DomainName { get; set; }
}