WebClient UploadString

Question

有問題。

雖然後處理用的Web服務，我得到錯誤

iqws webservis = new iqws(); 
    WebClient wc = new WebClient(); 
    var ser = new JavaScriptSerializer(); 
    var serializedResult = ser.Serialize(webservis.getProducts()); 
    wc.Headers[HttpRequestHeader.ContentType] = "application/json"; 
    string result = wc.UploadString("http://localhost:3523/WS/iqws.asmx/getProducts", serializedResult); 
    var table = ser.Deserialize<Dictionary<string, dynamic>>(result); 

但有錯誤：遠程服務器返回錯誤：（500）內部服務器錯誤。

爲什麼？

[WebService(Namespace = "http://tempuri.org/")] 
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] 
[ScriptService] 
public class iqws : System.Web.Services.WebService 
{ 
    [WebMethod] 
    [ScriptMethod(ResponseFormat = ResponseFormat.Json)] 
    public string getProducts() 
    { 
     List<products> prd= new List<products>(); 
     SqlConnection cn = new SqlConnection(ado.cnStr); 
     SqlCommand cmd = new SqlCommand("SELECT * FROM products", cn); 
     cn.Open(); 
     SqlDataReader dr = cmd.ExecuteReader(); 
     while (dr.Read()) 
     { 
      products p = new products(); 
      p.name = dr["name"].ToString(); 
      p.money = dr["money"].ToString(); 
      prd.Add(p); 
     } 
     var jsonSerialiser = new JavaScriptSerializer(); 
     return jsonSerialiser.Serialize(prd); 
    } 
} 

和JSON後沒有問題..

$.ajax({ 
    type: "POST", 
    url: "/WS/iqws.asmx/getProducts", 
    contentType: "application/json; charset=utf-8", 
    //data: {}, 
    dataType: "json", 
    success: function (data) { 
     $("#jsonvalue").html(data.d); 
    }, 
    error: function (xhr, status, error) { 
     $("#jsonvalue").html(xhr.responseText); 
    } 
}); 

和結果;

[ 
    { 
    "name": "iPhone 4s Gold", 
    "code": null, 
    "money": "1899,0000", 
    "images": null, 
    "comments": null 
    }, 
    { 
    "name": "iPhone 5s Black", 
    "code": null, 
    "money": "2000,0000", 
    "images": null, 
    "comments": null 
    } 
] 

爲什麼我會收到錯誤？

Answer 1

雖然我質疑你試圖用你的代碼完成什麼，但最終你得到HTTP 500響應的原因是因爲你正在將數據發佈到不接受任何參數的Web服務方法。

要調用getProducts用POST，你需要調用wc.UploadString(...)一個空字符串：

string result = wc.UploadString("http://localhost:3523/WS/iqws.asmx/getProducts", String.Empty); 

---

這將檢索的產品清單。要上傳的產品，你需要一個不同的Web服務方法，例如：

public class Product 
{ 
    public String Name { get; set; } 
    public String Code { get; set; } 
    public String Money { get; set; } 
    public String Images { get; set; } 
    public String Comments { get; set; } 
} 

[WebService(Namespace = "http://tempuri.org/")] 
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] 
[System.ComponentModel.ToolboxItem(false)] 
[ScriptService] 
public class iqws : System.Web.Services.WebService 
{ 
    [WebMethod] 
    [ScriptMethod(ResponseFormat = ResponseFormat.Json)] 
    public string getProducts() 
    { 
     List<Product> prd = new List<Product>(); 
     //{ 
     // new Product() { Name = "myname", Code = "mycode" }, 
     // new Product() { Name = "myname2", Code = "mycode2" } 
     //}; 
     using (SqlConnection cn = new SqlConnection(ado.cnStr)) 
     { 
      SqlCommand cmd = new SqlCommand("SELECT * FROM Product", cn); 
      cn.Open(); 
      SqlDataReader dr = cmd.ExecuteReader(); 
      while (dr.Read()) 
      { 
       Product p = new Product(); 
       p.Name = dr["name"].ToString(); 
       p.Money = dr["money"].ToString(); 
       prd.Add(p); 
      } 
     } 

     return new JavaScriptSerializer().Serialize(prd); 
    } 

    [WebMethod] 
    [ScriptMethod] 
    [GenerateScriptType(typeof(Product))] 
    public void addProduct(Product p) 
    { 
     // Place your validation code here to ensure the Product property values are in expected whitelists. 
     using (SqlConnection cn = new SqlConnection(ado.cnStr)) 
     { 
      SqlCommand cmd = new SqlCommand("INSERT INTO Product (Name, Money) VALUES (@Name, @Money)", cn); 
      cmd.Parameters.AddWithValue("@Name", p.Name); 
      cmd.Parameters.AddWithValue("@Money", p.Money); 

      cn.Open(); 
      cmd.ExecuteNonQuery(); 
     } 
    } 
} 

，並查詢您的服務：

 var ser = new JavaScriptSerializer(); 
     WebClient wc = new WebClient(); 
     wc.Headers[HttpRequestHeader.ContentType] = "application/json"; 
     string url = Request.Url.GetLeftPart(UriPartial.Authority) + "/WS/iqws.asmx/getProducts"; 
     string json = wc.UploadString(url, String.Empty); 
     var data = ser.Deserialize<Dictionary<String, String>>(json); 
     List<Product> products = ser.Deserialize<List<Product>>(data["d"]);