返回对象类型而不是字符串类型

本文关键字：类型 字符串 对象 返回 | 更新日期: 2023-09-27 18:16:43

public interface IApiUserProvider
{
    Dictionary<Guid, string> UserNamesByToken { get; }
    string this[Guid token] { get; }

}
public class ApiUserProvider : IApiUserProvider
{
    private readonly ICacheProvider _cacheProvider;
    private readonly IEntitySet<ApiUser> _apiUsers;
    private string CacheKey
    {
        get
        {
            return string.Format("{0}-{1}", GetType().Name, "ApiUsersByToken");
        }
    }
    public ApiUserProvider(ICacheProvider cacheProvider, IEntitySet<ApiUser> apiUsers)
    {
        _cacheProvider = cacheProvider;
        _apiUsers = apiUsers;
    }
    public Dictionary<Guid, string> UserNamesByToken
    {
        get
        {
            return _cacheProvider.Get(CacheKey, () => _apiUsers.Where(u => u.IsActive).ToDictionary(u => u.Token, u => u.Name));
        }
    }
    public string this[Guid token]
    {
        get { return UserNamesByToken.GetValueOrDefault(token); }
    }
}

当我替换string this[Guid token] { get; }与ApiUser this[Guid token] { get; }我在这段代码中得到的错误如下

return string : cannot convert to object

return _cacheProvider.Get(CacheKey, () => _apiUsers.Where(u => u.IsActive).ToDictionary(u => u.Token, u => u.Name));

请告诉如何将其转换为对象类型

返回对象类型而不是字符串类型

首先，您必须更新字段UserNamesByToken

public Dictionary<Guid, ApiUser> UserNamesByToken
    {
        get
        {
            return _cacheProvider.Get(CacheKey, () => _apiUsers.Where(u => u.IsActive).ToDictionary(u => u.Token, u => u));
        }
    }

不要忘记更新ToDictionary(u => u.Token, u => u)

然后更新你的IApiUserProvider接口

public interface IApiUserProvider
{
    Dictionary<Guid, string> UserNamesByToken { get; }
    ApiUser this[Guid token] { get; }
}

，之后更新索引

public string this[Guid token]
{
    get { return UserNamesByToken.GetValueOrDefault(token); }
}

如果没有帮助，让我知道:)

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