呼救dds.Fill(ddt)报错,标准表达式中数据类型不匹配。我该怎么办呢
this.timer1.Interval = 1000;
this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
this.timer1.Start();
string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;";
strConnection += @"Data Source=Dv.mdb";
OleDbConnection objConnection = new OleDbConnection(strConnection);
objConnection.Open();
OleDbDataAdapter dds = new OleDbDataAdapter("select 题目 from 问答题 where 题号='" + this.label4.Text + "'", objConnection);
DataTable ddt = new DataTable();
dds.Fill(ddt);
this.richTextBox2.Text = ddt.Rows[0].ItemArray.GetValue(1).ToString();
this.timer1.Interval = 1000;
this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
this.timer1.Start();
string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;";
strConnection += @"Data Source=Dv.mdb";
OleDbConnection objConnection = new OleDbConnection(strConnection);
objConnection.Open();
OleDbDataAdapter dds = new OleDbDataAdapter("select 题目 from 问答题 where 题号='" + this.label4.Text + "'", objConnection);
DataTable ddt = new DataTable();
dds.Fill(ddt);
this.richTextBox2.Text = ddt.Rows[0].ItemArray.GetValue(1).ToString();
解决方案 »
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改为
DataSet ddt = new DataSet ();
strConnection += @"Data Source=Dv.mdb";
OleDbConnection objConnection = new OleDbConnection(strConnection); objConnection.Open();
OleDbDataAdapter da = new OleDbDataAdapter("select 答案 from 问答题 where 题号='" + this.label4.Text + "'", objConnection);
DataSet ds = new DataSet();
da.Fill(ds, "ds");
//this.richTextBox3.Text = da.Rows[0].ItemArray.GetValue(0).ToString();
this.richTextBox3.Text = da.ToString();