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在我的MVC項目我有這樣的模式：如何獲得自定義驗證器來驗證客戶端？
namespace CameraWebApp.Models
public class Images
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ImageId { get; set; }
[Required(ErrorMessage="Please enter your first name")]
public string SubmitterFirstName { get; set; }
[Required(ErrorMessage = "Please enter your surname name")]
public string SubmitterLastName { get; set; }
[ExistingFileName]
public string NameOfImage { get; set; }
[StringLength(140, ErrorMessage="Please reduce the length of your description to below 140 characters")]
[DataType(DataType.MultilineText)]
public string DescriptionOfImage { get; set; }
public string ImagePath { get; set; }
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public DateTime DateAdded { get; set; }
}
正如你可以看到NameOfImage屬性具有屬性[ExistingFileName]這是一個自定義的驗證，該驗證程序的代碼如下：
//Overiding isValid to make a custom Validator
protected override System.ComponentModel.DataAnnotations.ValidationResult IsValid(object value, System.ComponentModel.DataAnnotations.ValidationContext validationContext)
{
if (value!=null)
{
string fileName = value.ToString();
if (FileExists(fileName))
{
//If the file exists use default error message or the one passed in if there is one
return new ValidationResult(ExistingImageErrorMessage ?? defaultExistingImage);
}
else
{
return ValidationResult.Success;
}
}
else
{
//If theres no value passed in then use error message or default if none is passed
return new ValidationResult(ErrorMessage ?? DefaultErrorMessage);
}
}
bool FileExists(string fileName)
{
bool exists = false;
//A list is passed all the images
List<Images> images = cameraRepo.getAllImages().ToList();
//Loops through every image checking if the name already exists
foreach (var image in images)
{
if (image.NameOfImage==fileName)
{
exists = true;
break;
}
}
return exists;
}
以上每個屬性均在以下代碼中驗證客戶端：
@using (Html.BeginForm())
{
<div id="errorMessages">
@Html.ValidationSummary(false)
</div>
<label>base64 image:</label>
<input id="imageToForm" type="text" name="imgEncoded"/>
<label>First Name</label>
@Html.EditorFor(model => model.SubmitterFirstName)
<label>Last Name</label>
@Html.EditorFor(model => model.SubmitterLastName)
<label>Name of Image</label>
@Html.EditorFor(model => model.NameOfImage)
<label>Image Description</label>
@Html.EditorFor(model => model.DescriptionOfImage)
<input type=button id="button"value=" Camera button"/>
<input type="submit" value="Click this when your happy with your photo"/>
}
</div>
@Html.ActionLink("gfd!!", "DisplayLatest")
<script src="@Url.Content("~/Scripts/LiveVideoCapture.js")" type="text/javascript"></script>
全部驗證工作客戶端除了我的自定義驗證[ExisitingFileName]，我不知道爲什麼？有誰知道這可能是爲什麼？ 在此先感謝！