Question

我在datagridview中检查复选框中的值时遇到问题。我希望获得复选框选中的所有ID，但我只获得了最新的检查。

这是我的代码：

string Id = "";

ds_utilityTableAdapters.tbl_membersTableAdapter tam = new ds_utilityTableAdapters.tbl_membersTableAdapter();    
ds_utility.tbl_membersDataTable dtm = new ds_utility.tbl_membersDataTable();

foreach (DataGridViewRow row in dgv_members.Rows)    
{        
    if (row.Cells[0].Value != null && (Boolean)row.Cells[0].Value == true)
    {
        Id= row.Cells[1].Value.ToString();

        // using Id to display data in crystal report viewer  
        // but only read the latest checkbox value

        dtm = tam.GetDataBy_SearchId(Id); 

        // in my dataset (ds_utility), I wrote the query like this
        // SELECT * FROM tbl_members WHERE (Id = ?)
    }
}

如何编写查询以获取所有值？

Answer 1

从我看到你有多种选择：

创建ds_utility.tbl_membersDataTable列表，并在每次迭代后将表添加到列表中。这是最简单的方法，但它会给你带来问题，因为你必须首先遍历多个表。它看起来像这样：

string Id = "";

ds_utilityTableAdapters.tbl_membersTableAdapter tam = new    ds_utilityTableAdapters.tbl_membersTableAdapter();       List<ds_utility.tbl_membersDataTable> dtm = new List<ds_utility.tbl_membersDataTable>();

foreach (DataGridViewRow row in dgv_members.Rows)     {         if (row.Cells[0].Value != null && (Boolean)row.Cells[0].Value == true) {
    Id= row.Cells[1].Value.ToString();

    // using Id to display data in crystal report viewer  
    // but only read the latest checkbox value

    dtm.Add(tam.GetDataBy_SearchId(Id));

    // in my dataset (ds_utility), I wrote the query like this
    // SELECT * FROM tbl_members WHERE (Id = ?) } }

但在你的情况下，最好的选择是更改sql查询，而不是传递一个Id，传入Id的连接列表。您可以通过修改您的SQL来实现此目的：

SELECT * FROM tbl_members WHERE Id in (?)

将代码更改为：

string Id = "";

ds_utilityTableAdapters.tbl_membersTableAdapter tam = new ds_utilityTableAdapters.tbl_membersTableAdapter();    
ds_utility.tbl_membersDataTable dtm = new ds_utility.tbl_membersDataTable();
List<string> idList = new List<string>();

foreach (DataGridViewRow row in dgv_members.Rows)    
{        
    if (row.Cells[0].Value != null && (Boolean)row.Cells[0].Value == true)
    {
        Id= row.Cells[1].Value.ToString();

        // using Id to display data in crystal report viewer  
        // but only read the latest checkbox value

    idList.Add(Id);
    }
}

dtm = tam.GetDataBy_SearchId(string.Join(",", idList));

从datagridview中选中的复选框获取值c＃

1 个答案: