Question

我得到参数无效error.how来解决这个问题？

以下代码是服务器端

MemoryStream ms = new MemoryStream(ObjDt.ImgUpload);                  
                ms.Write(ObjDt.ImgUpload, 0, ObjDt.ImgUpload.Length);                
                System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);               
                image.Dispose();                
                image.Save(@"D:\Projects\WCF\WCF_ImageUpload\DamagedImages\" + strRandNo + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);                
                // image.Save(@"C:\DotNet\ImageUpload\DamagedImages\" + strRandNo + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
                //return strRandNo.ToString();
                string val = strRandNo.ToString();
IPAddress = "localhost:53865/WCF/Image" + val + ".jpg";

在这些代码中我得到参数无效错误。这些代码的Web配置是

<bindings>
      <basicHttpBinding>
        <binding name="StreamedBinding" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647" transferMode="Streamed">
          <readerQuotas maxDepth="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" maxStringContentLength="2147483647"/>
        </binding>
          </basicHttpBinding>
        </bindings>

<services>      
      <service name="Service" behaviorConfiguration="ServiceBehavior">
        <!-- <endpoint address="" binding="basicHttpBinding" bindingConfiguration="basicBinding1" contract="WCF_ImageUpload.IService1"></endpoint>-->
        <endpoint address="" binding="basicHttpBinding"
                          bindingConfiguration="StreamedBinding" bindingName="ServiceBehavior"
                          contract="WCF_ImageUpload.IService1" />
      </service>
    </services>

我在Windows应用程序中使用了以下客户端应用程序。

Uri uri = new Uri("http://localhost:53865/Service1.svc/UploadDamagedImage");
            Details ObjDt = new Details();
            ObjDt.Name = "hi";
            ObjDt.Email = "hi@gmail.com";
            ObjDt.ContactNumber = "3698754215";
            ObjDt.DeviceModel = "E23";
            ObjDt.Problem = "Repair";
            ObjDt.Besttimetocontact = "9am";
byte[] bytes = File.ReadAllBytes("D:/WCFImages/admin.png");
ObjDt.ImgUpload = bytes;
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Details));
            // xmlserializer xser = new xmlserializer();
            MemoryStream mem = new MemoryStream();
            ser.WriteObject(mem, ObjDt);
            string data = Encoding.UTF8.GetString(mem.ToArray(), 0, (int)mem.Length);
            WebClient webClient = new WebClient();
            webClient.UploadStringCompleted += new UploadStringCompletedEventHandler(webClient_UploadStringCompleted);
            webClient.Headers["Content-type"] = "application/json";
            webClient.Encoding = Encoding.UTF8;
            webClient.UploadStringAsync(uri, "POST", data);

Answer 1

请告诉我们发生异常的行 - 另外，请提供堆栈跟踪。以下是我通过快速浏览您发布的代码看到的内容......

此行无效C＃语法：

IPAddress = "http://localhost:53865/WCF/Image" + val + ".jpg";

此外，字符串不代表IP地址，因此无法将其分配给IPAddress类型的对象。我假设IPAddress不是变量名，因为C＃的命名约定状态变量名应该以小写字母开头。

除此之外，代码存在缺陷。你正在创建图像，然后你处理它然后你试图保存它。

System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);               
image.Dispose();                
image.Save(@"D:\Projects\WCF\WCF_ImageUpload\DamagedImages\" + strRandNo + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

应该是另一种方式：创建，保存，处置：

System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);               
image.Save(@"D:\Projects\WCF\WCF_ImageUpload\DamagedImages\" + strRandNo + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg); 
image.Dispose();

甚至更好：

using (System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true))              
{
    image.Save(@"D:\Projects\WCF\WCF_ImageUpload\DamagedImages\" + strRandNo + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg); 
}

修改
在您的评论中，您说从流中加载图像的行会引发错误。这导致您应该检查以下内容：

执行以下两行是多余的（甚至是你的情况下的错误）：

MemoryStream ms = new MemoryStream(ObjDt.ImgUpload); ms.Write(ObjDt.ImgUpload, 0, ObjDt.ImgUpload.Length);

第一行创建基于ObjDt.ImgUpload中给出的字节的内存流（该行已经“包含图像”）。然后，您再次将字节写入流。从流的构造函数中删除参数或删除将字节写入流的行。

总而言之，这两行导致流不包含有效的图像数据，因为它连续两次包含图像字节。此外，我不确定bool参数是否表明流中存在颜色管理信息 - 将其删除以进行测试。代码应为：

using (MemoryStream ms = new MemoryStream(ObjDt.ImgUpload)) using (System.Drawing.Image image = System.Drawing.Image.FromStream(ms)) { image.Save(@"D:\Projects\WCF\WCF_ImageUpload\DamagedImages\" + strRandNo + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg); }

参数无效错误

1 个答案: