执行两个LINQ IQueryable的OR [英] Perform an OR of two LINQ IQueryables

问题描述

我有两个IQueryable：

  public static IQueryable< Counterparty> SearchByCode（这个IQueryable< Counterparty>可查询，字符串searchQuery）
 {
 return queryable.Where（x => x.Code.StartsWith（searchQuery.ToUpper（）））; 
} 
 
 public static IQueryable< Counterparty> SearchByName（这个IQueryable< Counterparty>可查询，字符串searchQuery）
 {
 return queryable.Where（x => x.Name.ToLower（）。包含（searchQuery.ToLower（））） 
} 
  

我想创建另一个IQueryable，它将两个查询组合为一个OR，例如

  public static IQueryable< Counterparty> SearchByCodeOrName（此IQueryable< Counterparty>可查询的字符串searchQuery）
 {
 //返回SearchByName（searchQuery）或SearchByCode（searchQuery）
} 
  / pre> 
 
 
我宁愿避免重复的代码，所以我想重用现有的可查询，而不是重写一个新的lambda表达式，如 Where（x => x.Code.StartsWith .... || x.Name.Contains .....） 
解决方案
根据你想要重用的代码，这可能是一个替代方法，在这里你不会重复查询条件的内部工作：
  private static Func< Counterparty，string，bool> CodeStartsWith =（x，searchQuery）=> x.Code.StartsWith（searchQuery.ToUpper（））; 
 
 private static Func< Counterparty，string，bool> NameContains =（x，searchQuery）=> x.Name.Contains（searchQuery.ToLower（））; 
 
 public static IQueryable< Counterparty> SearchByCode（这个IQueryable< Counterparty>可查询，字符串searchQuery）
 {
 return queryable.Where（x => CodeStartsWith（x，searchQuery））; 
} 
 
 public static IQueryable< Counterparty> SearchByName（这个IQueryable< Counterparty>可查询的字符串searchQuery）
 {
 return queryable.Where（x => NameContains（x，searchQuery））; 
} 
 
 public static IQueryable< Counterparty> SearchByCodeOrName（这个IQueryable< Counterparty>可查询的字符串searchQuery）
 {
 return queryable.Where（x => NameContains（x，searchQuery）|| CodeStartsWith（x，searchQuery））; 
} 
  
 
I've got two IQueryables:
    public static IQueryable<Counterparty> SearchByCode(this IQueryable<Counterparty> queryable, string searchQuery)
    {
        return queryable.Where(x => x.Code.StartsWith(searchQuery.ToUpper()));
    }

    public static IQueryable<Counterparty> SearchByName(this IQueryable<Counterparty> queryable, string searchQuery)
    {
        return queryable.Where(x => x.Name.ToLower().Contains(searchQuery.ToLower()));
    }
I want to create another IQueryable which combines the two queries as an OR e.g 
    public static IQueryable<Counterparty> SearchByCodeOrName(this IQueryable<Counterparty> queryable, string searchQuery)
    {
        // return SearchByName(searchQuery) OR SearchByCode(searchQuery)
    }
I'd rather avoid duplication of code so I want to reuse the existing queryables rather than rewriting a new lambda expression like Where(x=> x.Code.StartsWith.... || x.Name.Contains.....)
解决方案
Depending on what code you do want to be able to reuse, this could be an alternative way of doing it where you are not duplicating the inner workings of your query conditions:
    private static Func<Counterparty, string, bool> CodeStartsWith = (x, searchQuery) => x.Code.StartsWith(searchQuery.ToUpper());

    private static Func<Counterparty, string, bool> NameContains = (x, searchQuery) => x.Name.Contains(searchQuery.ToLower());

    public static IQueryable<Counterparty> SearchByCode(this IQueryable<Counterparty> queryable, string searchQuery)
    { 
        return queryable.Where(x => CodeStartsWith(x, searchQuery)); 
    }

    public static IQueryable<Counterparty> SearchByName(this IQueryable<Counterparty> queryable, string searchQuery)
    {
        return queryable.Where(x => NameContains(x, searchQuery)); 
    }

    public static IQueryable<Counterparty> SearchByCodeOrName(this IQueryable<Counterparty> queryable, string searchQuery)
    {
        return queryable.Where(x => NameContains(x, searchQuery) || CodeStartsWith(x, searchQuery)); 
    }


                        
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