Jquery的.post说解（二）

$.post

调用webservice，通过Response来返回数据。

（一）Hello

·ws

[WebMethod]
public void HelloWorld()
{
    HttpResponse Response = HttpContext.Current.Response;
    Response.ContentEncoding = System.Text.Encoding.Default;
    Response.Write("Hello world!");
}

·ajax post

function ajaxVoidHello() {
    $.post(
    "post_2.asmx/HelloWorld",
    function(data) {
        var jsonString = data.text;
        $("#divmessage").html(data);
    },
    "json"
    );
}

客户端得到的数据类型为string类型。

（二）得到客户实体

·ws

[WebMethod]
public void GetCustomer()
{
    Customer customer = new Customer 
        { Unid = 1, CustomerName = "宋江", Memo = "天魁星", Other = "黑三郎" };

    string strJson = Newtonsoft.Json.JsonConvert.SerializeObject(customer); 

    HttpResponse Response = HttpContext.Current.Response;
    Response.ContentEncoding = System.Text.Encoding.Default;
    Response.ContentType = "application/json";
    Response.Write(strJson);
}

这里ContentType很重要，这里要保留，即使空值也可以。

·ajax post

function ajaxGetCustomer() {
    $.post(
    "post_2.asmx/GetCustomer",
    function(data) {
        var jsonString = data;
        var jsonObject = $.jsonToObject(jsonString); 

        var tt = '';
        $.each(jsonObject, function(k, v) {
            tt += k + ":" + v + "<br/>";
        });

        $("#divmessage").html(tt);
    },
   "json"
);}

请求json数据，返回的是一个字符串，就是json字串，然后处理。

（三）得到客户集

·ws

[WebMethod]
public void GetCustomersList()
{
    Customer customer = new Customer 
       { Unid = 1, CustomerName = "宋江", Memo = "天魁星", Other = "黑三郎" };

    Customer customer2 = new Customer 
       { Unid = 2, CustomerName = "吴用", Memo = "天机星", Other = "智多星" }; 

    List<Customer> _list = new List<Customer>();
    _list.Add(customer);
    _list.Add(customer2);
    string strJson = Newtonsoft.Json.JsonConvert.SerializeObject(_list); 

    HttpResponse Response = HttpContext.Current.Response;
    Response.ContentEncoding = System.Text.Encoding.Default;
    Response.ContentType = "application/json";
    Response.Write(strJson);
}

·ajax post

function ajaxGetCustomerList() {
    $.post(
    "post_2.asmx/GetCustomersList",
    function(data) {
        alert(data);
        var jsonString = data;
        var jsonObject = $.jsonToObject(jsonString); 

        var tt = '';
        $.each(jsonObject, function(k, v) {
            $.each(v, function(kk, vv) {
                tt += kk + ":" + vv + "<br/>";
            });
        });
        $("#divmessage").html(tt);
    },
   "json"
);}

这些很容易理解了，返回的是json字串。处理字串就可以了。

（四）带参数的

·ws

[WebMethod]
public void GetCustomersListWithPara(int iUnid)
{

    Customer customer = new Customer 
        { Unid = 1, CustomerName = "宋江", Memo = "天魁星", Other = "黑三郎" };

    Customer customer2 = new Customer 
        { Unid = 2, CustomerName = "吴用", Memo = "天机星", Other = "智多星" }; 

    List<Customer> _list = new List<Customer>();
    _list.Add(customer);
    _list.Add(customer2); 

    var q = _list.Where(p => p.Unid == iUnid); 

    string strJson = Newtonsoft.Json.JsonConvert.SerializeObject(q); 

    HttpResponse Response = HttpContext.Current.Response;
    Response.ContentEncoding = System.Text.Encoding.Default;
    Response.ContentType = "";
    Response.Write(strJson);
}

·ajax post

function ajaxGetCustomerListWithPara() {
    $.post(
    "post_2.asmx/GetCustomersListWithPara",
    { iUnid: 1 },
    function(data) {
        var tt = '';
        $.each(data, function(k, v) {
            $.each(v, function(kk, vv) {
                tt += kk + ":" + vv + "<br/>";
            })
        });
        $("#divmessage").html(tt);
    },
   "json"
);}

这里返回的是[object,object]类型。

服务端的ContentType可以设置为空。