C＃创建一个获取特定银行所有分支的数据源

如何解决C＃创建一个获取特定银行所有分支的数据源

|| 我正在尝试为绑定导航器创建一个绑定源，该绑定源将能够显示特定银行中的所有分支机构。 获取数据源的语句如下

branchMasterBindingSource.DataSource = Program.Kernel.Get<IBranchMasterService>().GetAllBranchMasters();

但是，这将拉动所有分支机构，无论它们属于哪个银行。 我需要知道如何更改它，以使它获得AllBranchMasters，其中数据库中的字段（\“ U_bank_code \”）等于名为\“ cb_bank_code \”的组合框 额外的代码如下：

private void cb_bank_code_SelectedindexChanged(object sender,EventArgs e)
       {    

           branchMasterBindingSource.DataSource = null;
           branchMasterBindingSource.DataSource = Program.Kernel.Get<IBranchMasterService>().GetAllBranchMasters();

           //clear textfields after input
           lbl_show_bank_name.Text = string.Empty;
           txt_branch_code.Text = string.Empty;
           txt_branch_name.Text = string.Empty;
           txt_swift_sort_code.Text = string.Empty;
           txt_address_1.Text = string.Empty;
           txt_address_2.Text = string.Empty;
           txt_comments.Text = string.Empty;

           var bankMasterService = Program.Kernel.Get<IBankMasterService>();

           var bankMasters = from bm in bankMasterService.GetAllBankMasters()
                             where bm.U_Bank_code.Trim().Equals(cb_bank_code.Text.Trim(),StringComparison.CurrentCultureIgnoreCase)
                             select bm;

           if (bankMasters.Any(x => x != null))
           {
               var bankMaster = bankMasters.First();

               lbl_show_bank_name.Text = bankMaster.U_Bank_name;

               CbBankCode = bankMaster.U_Bank_code;

           }
           else
           {
               //clear textfields after input
               lbl_show_bank_name.Text = string.Empty;
           }

我是C＃和点网的新手，不知道如何更改语句的语法。任何帮助表示赞赏     

解决方法

        尽管您应该考虑重构数据访问方法以进行过滤，但类似的事情应该可以为您解决问题

private void cb_bank_code_SelectedIndexChanged(object sender,EventArgs e)
{  
   ClearTextfieldsAfterInput();

   branchMasterBindingSource.DataSource = GetSelectedBranchMasters();

   var bankMasters = GetSelectedBankMaster();

   if (bankMasters.Any(x => x != null))
   {
       var bankMaster = bankMasters.First();

       lbl_show_bank_name.Text = bankMaster.U_Bank_name;
       CbBankCode = bankMaster.U_Bank_code;
   }
   else
   {
       //clear textfields after input
       lbl_show_bank_name.Text = string.Empty;
   }
}

private IEnumerable<BankMaster> GetSelectedBankMaster()
{
    var selectedBank = cb_bank_code.Text.Trim();
    return Program.Kernel.Get<IBankMasterService>()
        .GetAllBankMasters()
        .Where(bm => bm.U_Bank_code.Trim().Equals(selectedBank,StringComparison.CurrentCultureIgnoreCase))
        .ToList();
}

private IEnumerable<BranchMaster> GetSelectedBranchMasters()
{
    var selectedBank = cb_bank_code.Text.Trim();
    return Program.Kernel.Get<IBranchMasterService>()
        .GetAllBranchMasters()
        .Where(branch => string.Equals(branch.U_bank_code,selectedBank,StringComparison.CurrentCultureIgnoreCase))
        .ToList();
}

private void ClearTextfieldsAfterInput()
{
   lbl_show_bank_name.Text = \"\";
   txt_branch_code.Text = \"\";
   txt_branch_name.Text = \"\";
   txt_swift_sort_code.Text = \"\";
   txt_address_1.Text = \"\";
   txt_address_2.Text = \"\";
   txt_comments.Text = \"\";
}

    ,        如果我对您的理解正确，并且对这些类型进行了一些假设，则应该可以进行以下操作：

branchMasterBindingSource.DataSource = Program.Kernel.Get<IBranchMasterService>().GetAllBranchMasters.Where(x => x.U_Bank_code.Trim().Equals(cb_bank_code.Text.Trim(),StringComparison.CurrentCultureIgnoreCase))

我猜

Program.Kernel.Get<IBranchMasterService>().GetAllBranchMasters

返回IEnumerable或List。对于返回所有库/分支的函数，您将无能为力，除非您执行以下任一操作： 更改GetAllBranchMasters以返回IQueryable-然后可以像上面一样应用过滤器，并在末尾添加.ToList（）以执行查询。 （推荐）创建第二种方法，该方法接受银行代码，并根据基础DAL返回分支。