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C# Dynamic database filtering with Linq Expression（3个答案）
两个月前关门了。
我希望实现一个系统，通过该系统，a使用“构建”条件，然后从数据库返回结果数据。目前，有一个存储过程，它生成SQL并执行它。这是一个我想消除的特殊问题。
我的问题来自于这样一个事实，即我的条件中可以有多个字段，对于每个字段，可能有1个或多个值，具有不同的潜在操作符。
例如，

from t in Contacts 
where t.Email == "email@domain.com" || t.Email.Contains ("mydomain")
where t.Field1 == "valuewewant"
where t.Field2 != "valuewedontwant"
select t

字段、条件和运算符存储在数据库（和List<FieldCriteria>）中，并且将是如下所示的一些东西（基于上述内容）;

Email, Equals, "email@domain.com"
Email, Contains, "mydomain" Field1,
Equals, "valuewewant" Field2,
DoesNotEqual, "valuewedontwant"

或

new FieldCriteria
{
FieldName = "Email",
Operator = 1, 
Value = "email@mydomain.com"
}

因此，使用我所拥有的信息，我希望能够构建一个具有任意数量条件的查询。我已经看到了以前指向Dynamic Linq和PredicateBuilder的链接，但无法将其视为解决我自己问题的解决方案。
如有任何建议，我们将不胜感激。
更新
根据关于动态Linq的建议，我想出了一个非常基本的解决方案，使用一个单一的操作符，两个字段和多个标准。

enum Operator
{
    Equals = 1,
}

class Condition
{
    public string Field { get; set; }
    public Operator Operator { get; set;}
    public string Value { get; set;}
}

void Main()
{
    var conditions = new List<Condition>();

    conditions.Add(new Condition {
        Field = "Email",
        Operator = Operator.Equals,
        Value = "email1@domain.com"
    });

    conditions.Add(new Condition {
        Field = "Email",
        Operator = Operator.Equals,
        Value = "email2@domain.com"
    });

    conditions.Add(new Condition {
        Field = "Field1",
        Operator = Operator.Equals,
        Value = "Chris"
    });

    var statusConditions = "Status = 1";

    var emailConditions = from c in conditions where c.Field == "Email" select c;
    var field1Conditions = from c in conditions where c.Field == "Field1" select c;

    var emailConditionsFormatted = from c in emailConditions select string.Format("Email=\"{0}\"", c.Value);
    var field1ConditionsFormatted = from c in field1Conditions select string.Format("Field1=\"{0}\"", c.Value);

    string[] conditionsArray = emailConditionsFormatted.ToArray();
    var emailConditionsJoined = string.Join("||", conditionsArray);
    Console.WriteLine(String.Format("Formatted Condition For Email: {0}",emailConditionsJoined));

    conditionsArray = field1ConditionsFormatted.ToArray();
    var field1ConditionsJoined = string.Join("||", conditionsArray);
    Console.WriteLine(String.Format("Formatted Condition For Field1: {0}",field1ConditionsJoined));


    IQueryable results = ContactView.Where(statusConditions);

    if (emailConditions != null)
    {
        results = results.Where(emailConditionsJoined);
    }

    if (field1Conditions != null)
    {
        results = results.Where(field1ConditionsJoined);
    }

    results = results.Select("id");

    foreach (int id in results)
    {
        Console.WriteLine(id.ToString());
    }
}

生成的SQL;

-- Region Parameters
DECLARE @p0 VarChar(1000) = 'Chris'
DECLARE @p1 VarChar(1000) = 'email1@domain.com'
DECLARE @p2 VarChar(1000) = 'email2@domain.com'
DECLARE @p3 Int = 1
-- EndRegion
SELECT [t0].[id]
FROM [Contacts].[ContactView] AS [t0]
WHERE ([t0].[field1] = @p0) AND (([t0].[email] = @p1) OR ([t0].[email] = @p2)) AND ([t0].[status] = @p3)

和控制台输出：

Formatted Condition For Email: Email="email1@domain.com"||Email="email2@domain.com"
Formatted Condition For Field1: Field1="Chris"

只需要清理这个，并添加其他操作员，它看起来很好。
到目前为止，如果任何人对此有任何意见，任何投入都将不胜感激