Question

我有一个搜索条件，可根据两种信息查找有关车辆的信息。第一个是容器名称和自定义声明

我有一个带文本搜索的按钮和两个文本框，第一个是容器名称文本，第二个是自定义声明。

我使用EF加入三个包含如下内容的表：

var query = (from con in db.Containers
             join v in db.Vehicles on con.cont_vehicleid equals v.vehl_VehicleID
             join cust in db.Custom_Captions on v.vehl_state equals cust.Capt_Code
             where cust.Capt_Family == "vehl_state" && v.vehl_Deleted == null && con.cont_Deleted == null &&
             v.vehl_ClearanceCompany == p.pusr_CompanyId && con.cont_Name.Contains(txtContNo.Text)
             select new
             {
                 cont_name = con.cont_Name,
                 vehl_Name = v.vehl_Name,
                 VehicleState = v.vehl_state,
                 vehl_drivername = v.vehl_drivername,
                 vehl_entrancedate = v.vehl_entrancedate,
                 vehl_customsdec = v.vehl_customsdec,
                 cont_rampid = v.vehl_rampid
             }).ToList();



var query2 = (from con in db.Containers
              join v in db.Vehicles on con.cont_vehicleid equals v.vehl_VehicleID
              join cust in db.Custom_Captions on v.vehl_state equals cust.Capt_Code
              where cust.Capt_Family == "vehl_state" && v.vehl_Deleted == null && con.cont_Deleted == null &&
              v.vehl_ClearanceCompany == p.pusr_CompanyId && con.cont_customdec.Contains(txtCust.Text)
              select new
              {
                  cont_name = con.cont_Name,
                  vehl_Name = v.vehl_Name,
                  VehicleState = v.vehl_state,
                  vehl_drivername = v.vehl_drivername,
                  vehl_entrancedate = v.vehl_entrancedate,
                  vehl_customsdec = v.vehl_customsdec,
                  cont_rampid = v.vehl_rampid
              }).ToList();

包含容器名称(txtContNo.Text)

的条件的第一个查询

第二个query2包含条件表单容器名(txtCust.Text)

这是我用来处理要执行的查询的if语句：

if (txtContNo.Text != null)
{
    rptVehl.DataSource = query;
    rptVehl.DataBind();
}
if (txtCust.Text != null)
{ 
    rptVehl.DataSource = query2;
    rptVehl.DataBind();
}

rptVehl是转发工具

每次编译代码都没有错误，但是当我在（txtContNo.Text）中输入容器名称时，没有数据出现，当我使用tracePoint时，第一个if语句中的代码属于（txtContNo.Text）并没有＆＃ 39; t hit。

当我输入自定义声明时，它有效并向我提供有关我搜索内容的数据吗？

注意：如果省略第一个if语句，第二个工作正常并给了我想要的输出。

我认为if逻辑存在问题。有人可以搞清楚吗？

Answer 1

没试过，你可以尝试这样的事情：

var query = (from con in db.Containers
             join v in db.Vehicles on con.cont_vehicleid equals v.vehl_VehicleID
             join cust in db.Custom_Captions on v.vehl_state equals cust.Capt_Code
             where cust.Capt_Family == "vehl_state" && v.vehl_Deleted == null && con.cont_Deleted == null &&
             v.vehl_ClearanceCompany == p.pusr_CompanyId &&( con.cont_Name.Contains(txtContNo.Text==null?con.cont_Name:txtContNo.Text)||con.cont_customdec.Contains(txtCust.Text==null?con.cont_customdec:txtCust.Text))
             select new
             {
                 cont_name = con.cont_Name,
                 vehl_Name = v.vehl_Name,
                 VehicleState = v.vehl_state,
                 vehl_drivername = v.vehl_drivername,
                 vehl_entrancedate = v.vehl_entrancedate,
                 vehl_customsdec = v.vehl_customsdec,
                 cont_rampid = v.vehl_rampid
             }).ToList();



    rptVehl.DataSource = query;
    rptVehl.DataBind();

Answer 2

我会在Linq做一个小改动，然后把它改成一个：

var query = (from con in db.Containers
             join v in db.Vehicles on con.cont_vehicleid equals v.vehl_VehicleID
             join cust in db.Custom_Captions on v.vehl_state equals cust.Capt_Code
             where cust.Capt_Family == "vehl_state" && v.vehl_Deleted == null && con.cont_Deleted == null &&
             v.vehl_ClearanceCompany == p.pusr_CompanyId

             select new
             {
               cont_name = con.cont_Name,
               vehl_Name = v.vehl_Name,
               VehicleState = v.vehl_state,
               vehl_drivername = v.vehl_drivername,
               vehl_entrancedate = v.vehl_entrancedate,
               vehl_customsdec = v.vehl_customsdec,
               cont_rampid = v.vehl_rampid
             }).ToList();

if(txtConNo.Text != "")
{
  query = query.Where(con => con.cont_Name.Contains(txtContNo.Text))
}

if(txtCust.Text != "")
{
  query = query.Where(con => con.cont_customdec.Contains(txtCust.Text))
}

最后，绑定到GridView：

rptVehl.DataSource = query;
rptVehl.DataBind();

Answer 3

首先，我要感谢所有有助于回答我问题的人。

我修改了AT-2016和Santhosh Nayak的代码

所以它对我有100％的作用。

{{1}}

我不会选择这个作为接受的答案，非常感谢你 AT-2016和Santhosh Nayak

一个搜索按钮和两个文本框if语句逻辑

3 个答案: