ASP.Net xml web服務屬性返回空值

Question

我在我的web服務器上有一個傳統的xml web服務。它有一個服務調用Main Service。Class的概述如下。

[WebService(Namespace = "http://tempuri.org/")] 
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] 
[System.ComponentModel.ToolboxItem(false)] 
    // [System.Web.Script.Services.ScriptService] 
public class MainService : System.Web.Services.WebService 
{ 


    private byte[] symmetricKey; 
    private byte[] symmetricIv; 

    public byte[] SymmetricKey 
    { 

     get { return symmetricKey; } 
     set { symmetricKey = value; } 
    } 
    public byte[] SymmetricIv 
    { 
     get { return symmetricIv; } 
     set { symmetricIv = value; } 
    } 

    //Constructor 

    public MainService() 
    { 
     this.GetDatabaseInstance(); 
    } 

//Some Web Methods Heare to create the Symmetric Key 
} 

在我的客戶，我有一個方法，在那裏我有以下盤帶

MainService mainService=new MainsService(); 

//Calling to Some web method to create symmetric keys and assign those properties 

//Now trying to access those properties 

var key=mainService.SymmetricKey; 

變量「鑰匙」是越來越空值，當我訪問that.But我調試Web服務類。私有變量正在獲取值。爲什麼值沒有出現在客戶端代碼中？可能是屬性是設置引用而沒有設置值？因爲我可以通過web方法返回OUT變量來訪問變量值？任何人都可以解釋答案嗎？

以下方法是Web方法，它是創建密鑰

[WebMethod] 
    //create a symmetric key and encript it using clients public key and return values 
    public bool CreateKeys(byte[] exponent, byte[] modulus) 
    { 
     try 
     { 
      //Create a new instance of the RSACryptoServiceProvider class. 
      var rsaCryptoServiceProvider = new RSACryptoServiceProvider(); 

      //Create a new instance of the RSAParameters structure. 
      RSAParameters rsaKeyInfo = new RSAParameters(); 

      //Set RSAKeyInfo to the public key values. 
      rsaKeyInfo.Modulus = modulus; 
      rsaKeyInfo.Exponent = exponent; 

      //Import key parameters into RSA. 
      rsaCryptoServiceProvider.ImportParameters(rsaKeyInfo); 

      //Create a new instance of the RijndaelManaged class. 
      var rijndaelManaged = new RijndaelManaged(); 
      rijndaelManaged.GenerateKey(); 
      rijndaelManaged.GenerateIV(); 

      //save the symmetric key and IV 
      SymmetricKey = rijndaelManaged.Key; 
      SymmetricIv = rijndaelManaged.IV; 

      //Encrypt the symmetric key and IV. 
      encryptedSymmetricKey = rsaCryptoServiceProvider.Encrypt(rijndaelManaged.Key, false); 
      encryptedSymmetricIv = rsaCryptoServiceProvider.Encrypt(rijndaelManaged.IV, false); 

      return true; 
     } 
     catch (Exception) 
     { 
      throw; 
     } 
    } 

Answer 1

在您的客戶端代碼使用的是var key=mainService.symmetricKey;

但symmetricKey是私人byte[]，不能被其contianing類型的外部訪問。所以，你將不得不使用public property SymmetricKey這樣

var key=mainService.SymmetricKey; 

更新：

我懷疑是造成該行的問題一定是這一場

 SymmetricKey = rijndaelManaged.Key; 

也CreateKeys方法裏面的catch塊拋出異常