C#WinFrom下载本地文件

        private void btnDownLoad_Click(object sender, EventArgs e)
        {
            DownLoad();
        }
        private void DownLoad()
        {
            string FilePath = System.Windows.Forms.Application.StartupPath + "\\" + "ProductLineCategoryImport.xlsx";//文件路径
            string FileName = Path.GetFileName(FilePath);
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.Title = "下载文件";
            saveFileDialog.Filter = "xlsx文件(*.xlsx)|*.xlsx";
 
            saveFileDialog.FileName = FileName;
            DialogResult dialogResult = saveFileDialog.ShowDialog(this);
            if (dialogResult == DialogResult.OK)
            {
                System.Net.WebClient client = new System.Net.WebClient();
                byte[] data = client.DownloadData(FilePath);//一个真正存放数据的地址，一般我们将连接存在数据库中，数据存放在数据服务器上
                FileStream fs = new FileStream(saveFileDialog.FileName, FileMode.Create);
                fs.Write(data, 0, data.Length);
                fs.Close();
                MessageBox.Show("下载成功！");
            }
        }

注: EXCEL模板文件,放在Debug文件夹的根目录里,和编译后的 XXXXXX.exe文件放一起