正在从验证摘要控件中删除重复的错误消息
本文关键字：删除 消息 错误 控件 验证 | 更新日期: 2023-09-27 18:30:07
我遇到的情况是，我有多个验证器在一个页面上显示相同的错误消息，当验证页面时，这些重复项会显示在验证摘要中。
我想从验证摘要服务器端删除这些重复项。
这是我想做的一些伪代码。
validationSummery.ErrorMessages = validationSummery.ErrorMessages.DistinctBy(x=>x.ErrorText);
查看验证控件后，似乎无法访问它显示的消息。
我可以在验证摘要到达之前迭代所有无效的页面验证器，并只将每个消息类型中的一个设置为有效，但这样我就不会在每个控件旁边获得错误消息。
有人知道怎么做吗？
这并不漂亮，但通过使用dotPeek获取ValidationSummary的源代码以及一些反射，我创建了一个UniqueMessageValidationSummary控件。
/// <summary>
/// Extended version of Validation Summary which overrides OnRender and re-implements get error
/// messages method to ensure the control only renders unique error messages.
///
/// Utilizes .NET code cleaned from .Peek and reflection to access subclass
/// </summary>
public class UniqueMessageValidationSummary : ValidationSummary
{
internal string[] GetErrorMessages(out bool inError)
{
var strArray = (string[])null;
inError = false;
var length = 0;
var validators = Page.GetValidators(ValidationGroup);
for (var index = 0; index < validators.Count; ++index)
{
var validator = validators[index];
if (!validator.IsValid)
{
inError = true;
if (validator.ErrorMessage.Length != 0)
++length;
}
}
if (length != 0)
{
strArray = new string[length];
var index1 = 0;
for (var index2 = 0; index2 < validators.Count; ++index2)
{
var validator = validators[index2];
if (!validator.IsValid && !string.IsNullOrEmpty(validator.ErrorMessage))
{
strArray[index1] = string.Copy(validator.ErrorMessage);
++index1;
}
}
}
var uniqueErrors = new List<string>();
if (strArray != null)
{
var objRegExp = new Regex("<(.|'n)+?>");
foreach (var error in strArray)
{
if (uniqueErrors.All(x => objRegExp.Replace(error, string.Empty) != objRegExp.Replace(x, String.Empty)))
{
uniqueErrors.Add(error);
}
}
}
return uniqueErrors.ToArray();
}
protected override void Render(HtmlTextWriter writer)
{
var renderUplevelCopy = true;
const BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
var baseType = GetType().BaseType;
if (baseType != null)
{
var field = baseType.GetField("renderUplevel", flags);
if (field != null)
renderUplevelCopy = (bool)field.GetValue(this);
}
string[] strArray;
bool flag1;
if (DesignMode)
{
flag1 = true;
renderUplevelCopy = false;
strArray = new[]
{
"ValSummary_error_message_1",
"ValSummary_error_message_2"
};
}
else
{
if (!Enabled)
return;
bool inError;
strArray = GetErrorMessages(out inError);
flag1 = ShowSummary && inError;
if (!flag1 && renderUplevelCopy)
Style["display"] = "none";
}
if (Page != null)
Page.VerifyRenderingInServerForm(this);
var flag2 = renderUplevelCopy || flag1;
if (flag2)
RenderBeginTag(writer);
if (flag1)
{
string text1;
string str1;
string str2;
string text2;
string text3;
switch (DisplayMode)
{
case ValidationSummaryDisplayMode.List:
text1 = "b";
str1 = string.Empty;
str2 = string.Empty;
text2 = "b";
text3 = string.Empty;
break;
case ValidationSummaryDisplayMode.SingleParagraph:
text1 = " ";
str1 = string.Empty;
str2 = string.Empty;
text2 = " ";
text3 = "b";
break;
default:
text1 = string.Empty;
str1 = "<ul>";
str2 = "<li>";
text2 = "</li>";
text3 = "</ul>";
break;
}
if (HeaderText.Length > 0)
{
writer.Write(HeaderText);
WriteBreakIfPresent(writer, text1);
}
if (strArray != null)
{
writer.Write(str1);
foreach (var t in strArray)
{
writer.Write(str2);
writer.Write(t);
WriteBreakIfPresent(writer, text2);
}
WriteBreakIfPresent(writer, text3);
}
}
if (!flag2)
return;
RenderEndTag(writer);
}
private static void WriteBreakIfPresent(HtmlTextWriter writer, string text)
{
if (text == "b")
{
writer.WriteBreak();
}
else
writer.Write(text);
}
}