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當需要上傳圖片時，
為了怕使用者上傳成其他檔案格式造成程式錯誤
所以需要檢查
sample code 如下:
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| /// <summary> | |
| /// 檢查上傳檔案是否為圖片格式 | |
| /// </summary> | |
| /// <param name="fileName">完整檔案名稱</param> | |
| /// <returns>True or False</returns> | |
| private Boolean CheckPhotoFormat(String fileName) | |
| { | |
| Boolean flag = false; | |
| String fileExtension = Path.GetExtension(fileName).ToLower(); | |
| String[] allowedExtensions = { ".jpg",".jpeg",".png",".gif"}; | |
| for (int i = 0; i < allowedExtensions.Length; i++) | |
| { | |
| if (allowedExtensions[i].ToString().Equals(fileExtension)) | |
| { | |
| flag = true; | |
| } | |
| } | |
| return flag; | |
| } |
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