ASP.NET绑定嵌套集合 [英] ASP.NET Bind Nested Collection

问题描述

I did a multilevel bind using index:

<input type="hidden" name="parent.Index" value="aaa" />
<input type="text" name="parent[aaa].Category" value="Cat1" />
<input type="text" name="parent[aaa].SubCategory" value="SubCat1" />

<input type="hidden" name="parent.Index" value="bbb" />
<input type="text" name="parent[bbb].Category" value="Cat2 />
<input type="text" name="parent[bbb].SubCategory" value="SubCat2" />

<input type="hidden" name="parent.Index" value="ccc" />
<input type="text" name="parent[ccc].Category" value="Cat3" />
<input type="text" name="parent[ccc].SubCategory" value="SubCat3" />

<input type="hidden" name="parent[ccc].products.Index" value="123" />
<input type="text" name="parent[ccc].products[123].Name" value="Chips" />
<input type="text" name="parent[ccc].products[123].Price" value="2.23" />

The parent.index models are bond correctly but the parent[aaa].products.Index are not.

If I have 3 categories, aaa, bbb and ccc but for exemple only ccc has a product, it binds the product to aaa instead of ccc, in other words, any gap of products between categories it bind the product to the previous parent with no product

Thanks for any help.

推荐答案

我建​​议你阅读： ASP.NET中的分层数据绑定 [ ^ ]

I'd suggest to read this: Hierarchical Data Binding in ASP.NET[^]

I'm having trouble to bind a 2 level nested model. Here is what I've come up so far.

Model:

RequestSignature Model:

public class RequestSignature
{
    public int Id { get; set; }
    public string name { get; set;}
    public virtual ICollection<Pages> Pages { get; set; }
    public virtual ICollection<SignaturesImages> SignaturesImages { get; set; }
}
Pages Model:

public class Pages
{
    public int Id { get; set; }
    public string PageName {get; set;}
    public int RequestSignatureId { get; set; }
    [ForeignKey("RequestSignatureId")]
    public virtual RequestSignature RequestSignature { get; set; }
    public virtual ICollection<Signatures> Signatures { get; set; }
}
And Signatures Model:

public class Signatures
{
    public int Id { get; set; }<br>
    public Date SignatureDate { get; set;}
    public int? PagesId { get; set; }
    [ForeignKey("PagesId")]
    public virtual Pages Pages { get; set; }
}
Item 1:

<input type="text" name="RequestSignature.name" value="Joe Smith" />

<input type="hidden" name="RequestSignature.Pages.Index" value="aa1" /><br>
<input type="text" name="RequestSignature.Pages[aa1].PageName" value="My Page /><br>
<input type="hidden" name="RequestSignature.Pages[aa1].Signatures.Index" value="aa2" /><br>
<input type="text" name="RequestSignature.Pages[aa1].Signatures[aa2].SignatureDate" value="12/22/2014" />
Item 2:

<input type="text" name="RequestSignature.name" value="MattJohnson" />

<input type="hidden" name="RequestSignature.Pages.Index" value="bb1" /><br>
<input type="text" name="RequestSignature.Pages[bb1].PageName" value="My Page />
Item 3:

<input type="text" name="RequestSignature.name" value="Bob Dylan" />

<input type="hidden" name="RequestSignature.Pages.Index" value="cc1" /><br>
<input type="text" name="RequestSignature.Pages[cc1].PageName" value="My Page /><br>
<input type="hidden" name="RequestSignature.Pages[cc1].Signatures.Index" value="cc2" /><br>
<input type="text" name="RequestSignature.Pages[cc1].Signatures[cc2].SignatureDate" value="12/22/2014" />

The problem is that since the Item 2 has no Signature(only one level) and it does not have a child hidden field, the Signature on Item 3 is being bonded to Item 2.

To save, I'm calling:

db.RequestSignature.Add(RequestSignature);
db.SaveChanges();

If I stop to debug before saving, It shows the Signature being bonded to the correct Item, even if there is a gap of signatures between Items but when the save happens, like I said, If the Item 2 has no signature, it saves the Signature3 as a child of Signature2

Thanks for any help....

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