Question

我正在使用Entity Framework，我有8个项目：

IQueryable<Project> projects = _context.Projects.AsQueryable();

Boolean? a = null;

projects = projects.Where(x => a == null);

var result = projects.ToList();

不应该有8个项目吗？我没有......

更新1

在我的项目代码中，我正在做的是：

var result = projects.Where(x => x.IsActive == query.IsActive || query.IsActive == null);

所以我只有在query.IsActive不为null时才会被激活...

更新2

我刚刚尝试了以下内容：

var c = await projects.Where(x => true).Select(x => x.Id).ToListAsync();

var b = await projects.Where(x => condition == null).Select(x => x.Id).ToListAsync();

得到了疑问：

SELECT [x].[Id]
FROM [Projects] AS [x]
WHERE 1 = 1

SELECT [x].[Id]
FROM [Projects] AS [x]
WHERE @__condition_0 = NULL

Answer 1

关闭，因为这是一个Entity Framework Core RC2错误： https://github.com/aspnet/EntityFramework/issues/5499

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