谢谢。但是出现了个问题，如果我在string path = lvFileList.Items[i].Text;处设断点调试，满足条件的可以完成上传。但是不设断点调试，就会出现漏传。

上传代码如下：

private void btnUpLoadFile_Click(object sender, EventArgs e)
        {
            if (lvFileList.Items.Count <= 0)
            {
                MessageBox.Show("请添加上传文件！");               
            }
            else
            {
                #region  上传实现

                for (int i = 0; i < lvFileList.Items.Count; i++)
                {
                    //lvFileList.Items[i].Checked = true;
                    //lvFileList.Items[i].Selected = true;

                    string path = lvFileList.Items[i].Text;

                    #region 上传文件名称、服务路径设置
                   
                    //是否重命名
                    bool reName = true;
                    //定义文件类型，新的文件名，服务器路径
                    string fileNameExt;
                    string newFileName;
                    string pServerPath;
                    if (reName)
                    {
                        //获取文件扩展名
                        //fileNameExt = filepath.Substring(filepath.LastIndexOf(".") + 1);
                        fileNameExt =path .Substring ( path.LastIndexOf(".") + 1);
                        //定义重命名规则
                        newFileName = DateTime.Now.ToString("yyMMddhhmmss") + "." + fileNameExt;

                    }
                    else
                    {
                        newFileName = filepath.Substring(filepath.LastIndexOf("\\") + 1);
                    }
                    //服务器路径规则
                    if (!txtSavePath.Text.EndsWith("/") && !txtSavePath.Text.EndsWith("\\"))
                    {
                        txtSavePath.Text = txtSavePath.Text + "\\";
                    }

                    //服务器完整保存路径
                    pServerPath = txtSavePath.Text + newFileName;

                    #endregion
                    //实现上传

                    WebClient myWebClient = new WebClient();
                    myWebClient.Credentials = CredentialCache.DefaultCredentials;

                    myfilestream = new FileStream(path, FileMode.Open, FileAccess.Read);
                  
                    //获取文件大小
                    double pSize = Convert.ToDouble(Convert.ToDouble(myfilestream.Length) / Convert.ToDouble(1024));
                   
                    //文件大小控制
                    if (pSize / 1024 <= 10)
                    {
                        BinaryReader br = new BinaryReader(myfilestream);

                        try
                        {

                            byte[] postArray = br.ReadBytes((int)myfilestream.Length);
                            //实例化poststream
                            Stream postStream = myWebClient.OpenWrite(pServerPath, "PUT");
                            if (postStream.CanWrite)
                            {
                                //写出流
                                postStream.Write(postArray, 0, postArray.Length);
                            }
                            else
                            {
                                MessageBox.Show("文件目前不可写！");
                            }

                            postStream.Close();
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.Message);
                        }
                    }
                }
                MessageBox.Show("文件上传完成！");

                #endregion
            }
        }