如何动态地指定的LINQ排序依据的说法？ [英] How do I specify the Linq OrderBy argument dynamically?

问题描述

我如何使用指定的值我采取作为参数传递给排序依据的说法？

例如：

 列表＆LT;的Student GT; existingStudends =新的List＆LT;的Student GT; {新的学生{...}，新的学生{...}}
 

目前实现：

 列表＆LT;的Student GT; orderbyAddress = existingStudends.OrderBy（C =＆GT; c.Address）.ToList（）;
 

而不是 c.Address ，我怎么可以把它看作一个参数？

示例

 字符串参数=城;
 清单＆LT;的Student GT; orderbyAddress = existingStudends.OrderByDescending（C =＆GT;参数）.ToList（）;
 

解决方案

下面是一个方法可行使用反射...

  VAR参数=地址;
VAR的PropertyInfo = typeof运算（学生）.GetProperty（参数）;
VAR orderByAddress = items.OrderBy（X =＆GT; propertyInfo.GetValue（X，NULL））;
 

How do I specify the argument passed to orderby using a value I take as a parameter?

Ex:

List<Student> existingStudends = new List<Student>{ new Student {...}, new Student {...}}

Currently implementation:

List<Student> orderbyAddress = existingStudends.OrderBy(c => c.Address).ToList();

Instead of c.Address, how can I take that as a parameter?

Example

 string param = "City";
 List<Student> orderbyAddress = existingStudends.OrderByDescending(c => param).ToList();

解决方案

Here's a possiblity using reflection...

var param = "Address";    
var propertyInfo = typeof(Student).GetProperty(param);    
var orderByAddress = items.OrderBy(x => propertyInfo.GetValue(x, null));

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