C# 在C中将ACCESS数据库中的值设置为标签#

我想将Access数据库中的数据添加到

标签

。使用

FORM1

上的查询搜索数据

OleDbConnection connection = new OleDbConnection();
connection.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Ty\Documents\Uni\Level6\Project\App\software\Databases\Boards.accdb;Persist Security Info=False;";
connection.Open();
OleDbCommand commandBoards = new OleDbCommand();
commandBoards.Connection = connection;
string queryBoardsLength = "select * from [Boards] where [Length] >=" + TxtLength.Text;
string queryBoardsWidth = "select * from [Boards] where [Width] >=" + TxtWidth.Text;
commandBoards.CommandText = queryBoardsLength;
commandBoards.CommandText = queryBoardsWidth;
OleDbDataReader readerBoards = commandBoards.ExecuteReader();

while (readerBoards.Read())
{
    ComBoards.Items.Add(readerBoards["ID"].ToString());
}

这将使用搜索结果填充

FORM1

上的组合框。然后，当选择组合框时，我将其设置为变量

private void ComBoards_SelectedIndexChanged(object sender, EventArgs e)
{
    Boards = this.ComBoards.GetItemText(this.ComBoards.SelectedItem);
}

在

FORM2

上，我运行了一个类似的查询，根据所选

ID

从Access数据库收集准确的数据。我想将长度显示为

标签

private void Form2_Load(object sender, EventArgs e)
{
    lblBoardname.Text = Form1.Boards;
    OleDbConnection connectionBoards = new OleDbConnection();
    connectionBoards.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Ty\Documents\Uni\Level6\Project\App\software\Databases\Boards.accdb;Persist Security Info=False;";
    connectionBoards.Open();
    OleDbCommand commandBoardsget = new OleDbCommand();
    commandBoardsget.Connection = connectionBoards;
    string queryBoardsget = "select * from [Boards] where [ID] =" + lblBoardname;
    commandBoardsget.CommandText = queryBoardsget;
    OleDbDataReader readerBoardsget = commandBoardsget.ExecuteReader();
    while (readerBoardsget.Read())
    {
        lblBoardsizel.Text = readerBoardsget["Length"].ToString();
    }

除了

FORM2

上的

读卡器

之外，所有功能都正常工作，在那里我得到以下错误：

查询表达式“[ID]=System.Windows.Forms.Label，文本：Rhino Boards”中存在语法错误（逗号）

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我真的很感谢你的帮助。谢谢。

我不确定您是否能理解这条评论。如果可以，请阅读错误消息，它清楚地表明您正在传递整个label对象，而不是它的文本值。[ID]=“+LBoardName；应为[ID]=”+LBoardName.Text；嗨，谢谢你发现。。。简单的错误。然而，我仍然得到和错误。“查询表达式'[ID]=Rhino Boards'中的语法错误（缺少运算符）”