1、问题：编写webservice用以下方法生成公钥时，本地调试成功，但上传到虚拟空间后，提示找不到文件。

[WebMethod]
public string ReturnPublickKey()
{
    try
    {

        RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();

        string str_Public_Key = Convert.ToBase64String(RSA.ExportCspBlob(false));
        string str_Private_Key = Convert.ToBase64String(RSA.ExportCspBlob(true));
        return str_Public_Key;
    }
    catch (CryptographicException e)
    {
        Console.WriteLine(e.Message);
        return "no key";
    }
}

2、解决方法如下：

[WebMethod]
public string ReturnPublickKey()
{
    try
    {
        CspParameters RSAParams = new CspParameters();
        RSAParams.Flags = CspProviderFlags.UseMachineKeyStore;

        RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(1024, RSAParams);

        string str_Public_Key = Convert.ToBase64String(RSA.ExportCspBlob(false));
        string str_Private_Key = Convert.ToBase64String(RSA.ExportCspBlob(true));
        return str_Public_Key;
    }
    catch (CryptographicException e)
    {
        Console.WriteLine(e.Message);
        return "no key";
    }
}