C#/EF获取随机数据

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C#/EF获取随机数据

2017-09-19 10:43 .NET 暂无评论阅读(863)

/// <summary>
/// 获取随机推荐的资源
/// </summary>
public List<ResourceOutputDto> GetRandomRecommendResources(int count)
{
var result = new List<ResourceOutputDto>();
Random rd = new Random();
var maxCount = _resourceManager.GetAll().Where(f => f.Status == true).Count();
for (int i = 0; i < count; i++)
{
var randomCount = rd.Next(1, maxCount);
var model = _resourceManager.GetAll().Where(f => f.Status == true).OrderBy(f => f.Id).Skip(randomCount - 1).Take(1).FirstOrDefault();
if (model != null)
{
result.Add(model.MapTo<ResourceOutputDto>());
}
}
return result;
}