OData V4 系列 Ajax请求 CRUD

       OData 学习目录

       上一篇已经完成了服务创建，本篇主要介绍如何通过Ajax请求Odata服务，OData操作主要有 Get、Post、Patch、Put、Delete等操作。

　　  Post 操作       

        public async Task<IHttpActionResult> Post(Product product)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            _dbContext.Products.Add(product);
            await _dbContext.SaveChangesAsync();
            return Created(product);
        }

function addPro() {
        var pro = {
            Name: "OData Create",
            Price: 1024,
            Category: "IT"
        };
        //创建产品信息
        $.ajax({
            url: "/Odata/Products",
            type: "POST",
            contentType: "application/json; charset=utf-8",
            dataType: "JSON",
            data: JSON.stringify(pro),
            success: function (r) {
                alert(r.Id);
            },
            error: function (e) {
                debugger;
            }
        });
    }

         Patch 操作 只修改有变化的实体属性

public async Task<IHttpActionResult> Patch([FromODataUri] int key, Delta<Product> product)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            var entity = await _dbContext.Products.FindAsync(key);
            if (entity == null)
            {
                return NotFound();
            }
            product.Patch(entity);
            try
            {
                await _dbContext.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                throw;
            }
            return Updated(entity);
        }

var pro = {
            SupplierId: 2
        };

        //创建产品信息
        $.ajax({
            url: "/Odata/Products(" + id + ")",
            type: "Patch",
            contentType: "application/json; charset=utf-8",
            dataType: "JSON",
            data: JSON.stringify(pro),
            success: function (r) {
                debugger;
            },
            error: function (e) {
                debugger;
            }
        });

          Update 操作，修改所有实体

public async Task<IHttpActionResult> Put([FromODataUri] int key, Product update)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            if (key != update.Id)
            {
                return BadRequest();
            }
            _dbContext.Entry(update).State = EntityState.Modified;
            try
            {
                await _dbContext.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!Exists(key))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }
            return Updated(update);
        }

           Delete 操作

public async Task<IHttpActionResult> Delete([FromODataUri] int key)
        {
            var product = await _dbContext.Products.FindAsync(key);
            if (product == null)
            {
                return NotFound();
            }
            _dbContext.Products.Remove(product);
            await _dbContext.SaveChangesAsync();
            return StatusCode(HttpStatusCode.NoContent);
        }

function deletePro(id) {
        $.ajax({
            url: "/Odata/Products(" + id + ")",
            contentType: "application/json; charset=utf-8",
            type: "Delete",
            success: function (r) {
                debugger;
            },
            error: function (r) {
                debugger;
            }
        });
    }