ASP.NET MVC 中的集合绑定

模型绑定器，会处理一系列的集合类型。例子如下：

如果方法如下声明：

public ActionResult Blah(Person[] people) {
// ...
}

HTML如下：

<input type="text" name="people[0].FirstName" value="George" />
<input type="text" name="people[0].LastName" value="Washington" />
<input type="text" name="people[1].FirstName" value="Abraham" />
<input type="text" name="people[1].LastName" value="Lincoln" />
<input type="text" name="people[3].FirstName" value="Thomas" />
<input type="text" name="people[3].LastName" value="Jefferson" />

他在HTTP POST中：

people%5B0%5D.FirstName=George&people%5B0%5D.LastName=Washington&people%5B1%5D.FirstName=Abraham&people%5B1%5D.LastName=Lincoln&people%5B3%5D.FirstName=Thomas&people%5B3%5D.LastName=Jefferson

就像是：

people[0].FirstName = "George"
people[0].LastName = "Washington"
people[1].FirstName = "Abraham"
people[1].LastName = "Lincoln"
people[3].FirstName = "Thomas"
people[3].LastName = "Jefferson"

可以表示成：

people = new Person[] {
new Person() { FirstName = "George", LastName = "Washington" },
new Person() { FirstName = "Abraham", LastName = "Lincoln" }
};

我们访问key的方法就是parameterName[index].PropertyName。要注意的是：index必须从0开始，而且连续。在上述例子中，没有people[2]，所以在Abraham Lincoln后就停下不处理了。

再来看个更精彩的，如果方法声明如下：

public ActionResult Blah(IDictionary<string, Company> stocks) {
// ...
}

HTML表单如下：

<input type="text" name="stocks[0].Key" value="MSFT" />
<input type="text" name="stocks[0].Value.CompanyName" value="Microsoft Corporation" />
<input type="text" name="stocks[0].Value.Industry" value="Computer Software" />
<input type="text" name="stocks[1].Key" value="AAPL" />
<input type="text" name="stocks[1].Value.CompanyName" value="Apple, Inc." />
<input type="text" name="stocks[1].Value.Industry" value="Consumer Devices" />

就像是：

stocks[0].Key = "MSFT"
stocks[0].Value.CompanyName = "Microsoft Corporation"
stocks[0].Value.Industry = "Computer Software"
stocks[1].Key = "AAPL"
stocks[1].Value.CompanyName = "Apple, Inc."
stocks[1].Value.Industry = "Consumer Devices"

那么绑定器就会做如下绑定：

stocks = new Dictionary<string, Company>() {
{ "MSFT", new Company() { CompanyName = "Microsoft Corporation", Industry = "Computer Software" } },
{ "AAPL", new Company() { CompanyName = "Apple, Inc.", Industry = "Consumer Devices" } }
};