在ASP.NET Core 6中,OData Count可能不会返回正确的数据数量。这是因为ASP.NET Core 6中的默认OData实现(Microsoft.AspNetCore.OData)尚未完全支持Count功能。但是,您可以通过使用其他OData库来解决这个问题,例如OData.AspNetCore或Microsoft.AspNetCore.OData。
以下是使用OData.AspNetCore库的解决方法:
using OData.AspNetCore;
public void ConfigureServices(IServiceCollection services)
{
services.AddControllers();
services.AddOData();
}
using OData.AspNetCore;
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
app.UseRouting();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
endpoints.EnableDependencyInjection();
endpoints.Select().Expand().Filter().OrderBy().MaxTop(100).Count(); // 启用OData功能
endpoints.MapODataRoute("odata", "odata", GetEdmModel()); // 配置OData路由
});
}
private static IEdmModel GetEdmModel()
{
var builder = new ODataConventionModelBuilder();
builder.EntitySet("YourEntities");
return builder.GetEdmModel();
}
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.OData.Query;
using OData.AspNetCore;
[Route("api/[controller]")]
[ApiController]
public class YourController : ControllerBase
{
private readonly YourDbContext _context;
public YourController(YourDbContext context)
{
_context = context;
}
[HttpGet]
[EnableQuery]
public IActionResult Get(ODataQueryOptions options)
{
var query = options.ApplyTo(_context.YourEntities);
var totalCount = _context.YourEntities.Count(); // 手动计算记录总数
Response.Headers.Add("X-Total-Count", totalCount.ToString()); // 将记录总数添加到响应头中
return Ok(query);
}
}
通过以上步骤,您可以在ASP.NET Core 6中实现OData Count功能,并将记录总数正确返回给客户端。请注意,此解决方法使用了OData.AspNetCore库,并手动计算记录总数。