模型绑定ValueProvider追加到现有值+ 4 MVC [英] Model binder ValueProvider appends to the existing value + MVC 4
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问题描述
我有下面的方法在我的模型绑定：
保护覆盖对象CreateModel（ControllerContext controllerContext，ModelBindingContext的BindingContext，类型modelType）
{
如果（bindingContext.ValueProvider.GetValue（ID）== NULL）
{
字符串s = bindingContext.ValueProvider.GetValue（IsSoftDeleted）AttemptedValue。 布尔D = Convert.ToBoolean（S）;
返回OrgFactory.Create（bindingContext.ValueProvider.GetValue（标题）。AttemptedValue，
bindingContext.ValueProvider.GetValue（NameInUse）。AttemptedValue，
bindingContext.ValueProvider.GetValue（描述）。AttemptedValue，
D，新党（））;
}
其他
{
返回OrgFactory.Create（bindingContext.ValueProvider.GetValue（标题）。AttemptedValue，
bindingContext.ValueProvider.GetValue（NameInUse）。AttemptedValue，
bindingContext.ValueProvider.GetValue（描述）。AttemptedValue，
Convert.ToBoolean（bindingContext.ValueProvider.GetValue（IsSoftDeleted）AttemptedValue。））;
}
}
在create.cshtml看来，如果我检查IsSoftDeleted的chebox，其模型绑定值来为真，假时，它应该只真。
u能指教一下我做错了？
create.cshtml
@using PartyBiz.Models.Objects
@model组织@using（Html.BeginForm（创建，组织，FormMethod.Post））
{@ Html.ValidationSummary（真）
＆LT;＆字段集GT;
＆LT;传奇＆GT;创建一个新的组织与LT; /传说＆GT; ＆LT; DIV CLASS =编辑标记＆GT;
@ Html.LabelFor（型号=＆GT; model.Caption）
@ Html.EditorFor（型号=＆GT; model.Caption，新{@class =TXT}）
@ Html.ValidationMessageFor（型号=＆GT; model.Caption）
＆LT; / DIV＆GT; ＆LT; BR /＆GT; ＆LT; DIV CLASS =编辑标记＆GT;
@ Html.LabelFor（型号=＆GT; model.NameInUse）
@ Html.EditorFor（型号=＆GT; model.NameInUse，新{@class =TXT}）
@ Html.ValidationMessageFor（型号=＆GT; model.NameInUse）
＆LT; / DIV＆GT; ＆LT; BR /＆GT; ＆LT; DIV CLASS =编辑标记＆GT;
@ Html.LabelFor（型号=＆GT; model.Description）
@ Html.EditorFor（型号=＆GT; model.Description，新{@class =TXT}）
@ Html.ValidationMessageFor（型号=＆GT; model.Description）
＆LT; / DIV＆GT;
＆LT; DIV CLASS =编辑标记＆GT;
@ Html.LabelFor（O = GT; O.IsSoftDeleted）
@ Html.EditorFor（O = GT; O.IsSoftDeleted）
@ Html.ValidationMessageFor（O = GT; O.IsSoftDeleted）
＆LT; / DIV＆GT;
＆LT; BR /＆GT;
＆LT;输入类型=提交值=创建/＆GT;
＆LT; /字段集＆GT;
}
解决方案
您正试图解析的字符串值 true和false 来使用布尔的 Convert.ToBoolean 方法，它将超过明显失败。为应对这种情况的正确方法是简单地使用什么是已经内置到框架=>使用的 ValueProviderResult 的ConvertTo 方法$ C>将由的GetValue 方法返回。
就这样：
保护覆盖对象CreateModel（ControllerContext controllerContext，ModelBindingContext的BindingContext，类型modelType）
{
ValueProviderResult isSoftDeletedValue = bindingContext.ValueProvider.GetValue（IsSoftDeleted）;
//使用内置的方法到模型绑定正确转换
//值到相应的布尔类型
布尔isSoftDeleted =（布尔）isSoftDeletedValue.ConvertTo（typeof运算（布尔））; 如果（bindingContext.ValueProvider.GetValue（ID）== NULL）
{ 返回OrgFactory.Create（
bindingContext.ValueProvider.GetValue（标题）。AttemptedValue，
bindingContext.ValueProvider.GetValue（NameInUse）。AttemptedValue，
bindingContext.ValueProvider.GetValue（描述）。AttemptedValue，
isSoftDeleted，
新党（）
）;
} 返回OrgFactory.Create（
bindingContext.ValueProvider.GetValue（标题）。AttemptedValue，
bindingContext.ValueProvider.GetValue（NameInUse）。AttemptedValue，
bindingContext.ValueProvider.GetValue（描述）。AttemptedValue，
isSoftDeleted
）;
}
就是这样：
VAR isSoftDeletedValue = bindingContext.ValueProvider.GetValue（IsSoftDeleted）;
布尔isSoftDeleted =（布尔）isSoftDeletedValue.ConvertTo（typeof运算（布尔））;
请注意，我们在这里呼吁底层的ConvertTo 方法 ValueProviderResult 它知道如何正确处理情况
I have the below method in my model binder:
protected override object CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType)
{
if (bindingContext.ValueProvider.GetValue("Id") == null)
{
string s = bindingContext.ValueProvider.GetValue("IsSoftDeleted").AttemptedValue;
bool d = Convert.ToBoolean(s);
return OrgFactory.Create(bindingContext.ValueProvider.GetValue("Caption").AttemptedValue,
bindingContext.ValueProvider.GetValue("NameInUse").AttemptedValue,
bindingContext.ValueProvider.GetValue("Description").AttemptedValue,
d, new Party());
}
else
{
return OrgFactory.Create(bindingContext.ValueProvider.GetValue("Caption").AttemptedValue,
bindingContext.ValueProvider.GetValue("NameInUse").AttemptedValue,
bindingContext.ValueProvider.GetValue("Description").AttemptedValue,
Convert.ToBoolean(bindingContext.ValueProvider.GetValue("IsSoftDeleted").AttemptedValue));
}
}
in create.cshtml view, if I check the chebox for IsSoftDeleted, its value in model binder is coming as "true,false" when it should come only true.
Can u advise what I am doing wrong?
create.cshtml
@using PartyBiz.Models.Objects
@model Organization
@using (Html.BeginForm("Create", "Organization", FormMethod.Post))
{
@Html.ValidationSummary(true)
<fieldset>
<legend>Create a New Organization</legend>
<div class="editor-label">
@Html.LabelFor(model => model.Caption)
@Html.EditorFor(model => model.Caption, new { @class = "txt"})
@Html.ValidationMessageFor(model => model.Caption)
</div> <br />
<div class="editor-label">
@Html.LabelFor(model => model.NameInUse)
@Html.EditorFor(model => model.NameInUse, new { @class = "txt"})
@Html.ValidationMessageFor(model => model.NameInUse)
</div> <br />
<div class="editor-label">
@Html.LabelFor(model => model.Description)
@Html.EditorFor(model => model.Description, new { @class = "txt"})
@Html.ValidationMessageFor(model => model.Description)
</div>
<div class="editor-label">
@Html.LabelFor(O => O.IsSoftDeleted)
@Html.EditorFor(O => O.IsSoftDeleted)
@Html.ValidationMessageFor(O => O.IsSoftDeleted)
</div>
<br />
<input type="submit" value="Create" />
</fieldset>
}
解决方案
You are attempting to parse the string value of true,false to a boolean using the Convert.ToBoolean method which will more than obviously fail. The correct way to deal with this situation is to simply use what's already built into the framework => use the ConvertTo method on the ValueProviderResult that will be returned by the GetValue method.
Just like that:
protected override object CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType)
{
ValueProviderResult isSoftDeletedValue = bindingContext.ValueProvider.GetValue("IsSoftDeleted");
// use the built-in method into the model binder to correctly convert
// the value to the corresponding boolean type
bool isSoftDeleted = (bool)isSoftDeletedValue.ConvertTo(typeof(bool));
if (bindingContext.ValueProvider.GetValue("Id") == null)
{
return OrgFactory.Create(
bindingContext.ValueProvider.GetValue("Caption").AttemptedValue,
bindingContext.ValueProvider.GetValue("NameInUse").AttemptedValue,
bindingContext.ValueProvider.GetValue("Description").AttemptedValue,
isSoftDeleted,
new Party()
);
}
return OrgFactory.Create(
bindingContext.ValueProvider.GetValue("Caption").AttemptedValue,
bindingContext.ValueProvider.GetValue("NameInUse").AttemptedValue,
bindingContext.ValueProvider.GetValue("Description").AttemptedValue,
isSoftDeleted
);
}
That's it:
var isSoftDeletedValue = bindingContext.ValueProvider.GetValue("IsSoftDeleted");
bool isSoftDeleted = (bool)isSoftDeletedValue.ConvertTo(typeof(bool));
Notice that here we are calling the underlying ConvertTo method on the ValueProviderResult which knows how to correctly handle the situation.
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