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在C#中使用OData(Open Data Protocol)可以方便地访问和操作RESTful API返回的数据。以下是一些使用OData的技巧:
引入必要的命名空间:
using System.Web.OData; using System.Net.Http;
使用
ODataClient
类发起请求:var client = new ODataClient("https://api.example.com/odata");
查询数据:
var query = client.Products.Where(p => p.Category == "Electronics"); var results = await query.ToListAsync();
投影查询结果:
var products = await client.Products .AddQueryOptions(q => q.Filter(f => f.ReleaseDate < DateTime.Now)) .AddQueryOptions(q => q.Skip(10).Take(20)) .ToListAsync();
访问导航属性:
var firstProduct = results.First(); var relatedProducts = await firstProduct.RelatedProducts.ToListAsync();
使用
Select
和Expand
方法定制查询:var products = await client.Products .Select(p => new { p.Name, p.Price }) .Expand(p => p.Category) .ToListAsync();
处理分页:
var query = client.Products.Where(p => p.Category == "Electronics"); var pageCount = await query.CountAsync(); var currentPage = 1; var pageSize = 20;