今天遇到一个问题，linq语句的写法，查询动态字段

  public List<Location> getLocationList(int companyid, string searchValue, string searchField)
{
...
 var dbLocList = from x in _dbLocList
                            where x.company_id == companyid 
                            and   x的searchField==searchValue //这里要查询的字段是变量
                            select x;           
}
and那一句怎么实现

 

为list加一个扩展方法：

using System.Reflection;

public static class Extension
{
public static List<T> FinData<T>(this List<T> MyDataList, string CName, string CValue)
{
BindingFlags bindingFlags = BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static;
PropertyInfo[] propertyInfos = typeof(T).GetProperties(bindingFlags);
List<T> ResultList = new List<T>();
foreach (PropertyInfo propertyInfo in propertyInfos)
{
if (propertyInfo.Name == CName)
{
MyDataList.ForEach(
j =>
{
string re = propertyInfo.GetValue(j, null).ToString();
if (re == CValue)
{
ResultList.Add(j);
}
}
);
}
}
return ResultList;
}
}

上面的问题解决了：

var dbLocList =Extension.FinData(_dbLocList,searchField,searchValue);