彩票走势图

[.NET 2003版本]

DataAdapter

上述在设计时中的步骤可以通过一些编码来实现。这使您能更加自由和完全的控制数据库操作。

每个数据序列都拥有“DataSource”属性，属性决定了数据库值（表或查询）的来源，并且“YValues.DataMember”和“LabelMember”属性指定我们想要绘制的字段。

将一个新的TeeChart for .NET项目拖拽一个新的项目和一个新的窗体上。

[C#]

using System.Data;

using System.Data.OleDb;

using System.Security;

using System.Security.Permissions;

private void Form1_Load(object sender, System.EventArgs e) {

            DataSet masterDataSet = new DataSet();

            Bar bar1 = new Bar(tChart1.Chart);

            try

            {

                OpenConnWithJet40(ref masterDataSet);

                DataTable employeeTable = masterDataSet.Tables["EMPLOYEE"];

                bar1.YValues.DataMember = employeeTable.Columns["SALARY"].ToString();

                bar1.LabelMember = employeeTable.Columns["LASTNAME"].ToString();

                bar1.DataSource = employeeTable;

            }

            catch (SecurityException)

         ;   {

                MessageBox.Show("The calling method has not been granted sufficient permission to access the Microsoft Jet 4.0 OLE DB Provider.");

            }

}

[OleDbPermission(SecurityAction.Demand, Provider = "Microsoft.Jet.OLEDB.4.0")]

private void OpenConnWithJet40(ref DataSet masterDataSet) {

            OleDbConnection testConn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" + @"Data Source=C:\Program Files\Steema Software\TeeChart for .NET v3\Sample data\TeeChart.mdb;");          

            testConn.Open();

            string strCom = "SELECT * FROM Employee";

            OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom,testConn);

            myCommand.Fill(masterDataSet, "Employee");

            testConn.Close();

        }

[VB.Net]

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

            Dim MasterDataSet As New DataSet()

            Dim Bar1 As New Steema.TeeChart.Styles.Bar(TChart1.Chart)

            Try

          ;      OpenConnWithJet40(MasterDataSet)

                Dim employeeTable As DataTable = MasterDataSet.Tables("Employee")

                Bar1.YValues.DataMember = employeeTable.Columns("SALARY").ToString()

                Bar1.LabelMember = employeeTable.Columns("LASTNAME").ToString()

                Bar1.DataSource = employeeTable

          ;  Catch ex As Exception

                MessageBox.Show("Microsoft Jet 4.0 OLE DB Provider problem: " & ex.Message)

  ;          End Try

End Sub

Private Sub OpenConnWithJet40(ByRef MasterDataSet As DataSet)

            Dim TestConn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=C:\Program Files\Steema Software\TeeChart for .NET v3\Sample data\TeeChart.mdb;")

            TestConn.Open()

            Dim StrCom As String = "SELECT * FROM Employee"

            Dim MyCommand As New OleDbDataAdapter(StrCom, TestConn)

    ;        MyCommand.Fill(MasterDataSet, "Employee")

 ;           TestConn.Close()

        End Sub

End Class

在.NET 2005版本中，稍微有一些针对2005版的变化。

[.NET 2005版本]

DataAdapter

[C#]

using System.Data;

using System.Data.OleDb;

using System.Security;

using System.Security.Permissions;

private void Form1_Load(object sender, EventArgs e)

{

            //string ConnString = SqlDataSource1.ConnectionString;      

            string sQuery = "select * from Employee";          

            //SqlConnection myConnection = new SqlConnection(ConnString);            

            string myConnString = "Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\\Program Files\\Steema Software\\TeeChart for .NET v3\\Sample data\\TeeChart.mdb;Uid=Admin;Pwd=;";

            System.Data.Odbc.OdbcConnection myConnection = new System.Data.Odbc.OdbcConnection(myConnString);   

            //SqlCommand myCommand = new SqlCommand(sQuery, myConnection);

            System.Data.Odbc.OdbcCommand myCommand = new System.Data.Odbc.OdbcCommand(sQuery, myConnection);

            myConnection.Open();

            //SqlDataReader myReader = myCommand.ExecuteReader();

   ;         System.Data.Odbc.OdbcDataReader myReader = myCommand.ExecuteReader();

            int XColumn = myReader.GetOrdinal("ID");

            int YColumn = myReader.GetOrdinal("SALARY");

            int LabelColumn = myReader.GetOrdinal("LASTNAME");

            Steema.TeeChart.Styles.Bar bar1 = new Steema.TeeChart.Styles.Bar(tChart1.Chart);

            while (myReader.Read())

            {

                bar1.Add(Convert.ToInt32(myReader[XColumn]), Convert.ToDouble(myReader[YColumn]), Convert.ToString(myReader[LabelColumn]));

            }

           ; myReader.Close();

         ;   myConnection.Close();

}

[VB.Net]

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Loa

        Dim MasterDataSet As New DataSet()

        Dim Bar1 As New Steema.TeeChart.Styles.Bar(TChart1.Chart)

        Try

            OpenConnWithJet40(MasterDataSet)

            Dim employeeTable As DataTable = MasterDataSet.Tables("EMPLOYEE")

            Bar1.YValues.DataMember = employeeTable.Columns("SALARY").ToString()

            Bar1.LabelMember = employeeTable.Columns("LASTNAME").ToString()

            Bar1.DataSource = employeeTable

        Catch ex As Exception

           ; MessageBox.Show("Microsoft Jet 4.0 OLE DB Provider problem: " & ex.Message)

        End Try

End Sub

Private Sub OpenConnWithJet40(ByRef MasterDataSet As DataSet)  

        Dim TestConn As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=C:\Program Files\Steema Software\TeeChart for .NET v3\Sample data\TeeChart.mdb;")

        TestConn.Open()

        Dim StrCom As String = "SELECT * FROM Employee"

        Dim MyCommand As New OleDb.OleDbDataAdapter(StrCom, TestConn)

        MyCommand.Fill(MasterDataSet, "Employee")

        TestConn.Close()

    End Sub

End Class

如果数据库的值发生改变，你要“refresh”连接并重新检索值，你应该这样做：

TChart1.Series(0).CheckDataSource

“CheckDataSource”方法会迫使数据序列重新检索所有的记录。

所有的数据序列同样拥有“XValues.ValueSource”属性，这个属性只用在XY图表中（当你在每个点都拥有X坐标）。

单条记录

连接到表

使用图表编辑器将在窗体的初始化中创建下面的代码。类似的代码可用于在运行时创建并连接新的单条记录数据源。

（假设一个DataSet调用sourceTableSet的表单：sourceTable）

this.singleRecordSource1 = new Steema.TeeChart.Data.SingleRecordSource();

this.sourceTableSet.DataSetName = "NewDataSet";

this.sourceTableSet.Tables.AddRange(new System.Data.DataTable[] {this.sourceTable});

this.singleRecordSource1.DataSource = this.sourceTableSet;

this.singleRecordSource1.ValueMembers = new string[] {

 ;                                                            "JAN",

                                                             "FEB",

                                                             "MAR"};

this.bar1 = new Steema.TeeChart.Styles.Bar();

this.bar1.DataSource = this.singleRecordSource1;

表单检索

TeeChart的SingleRecord使用CurrencyManager组件来检索数据库的表单并更新到图表。在表单中的记录变更后应该使用CheckDatasource来更新图表。

例子

private CurrencyManager myCurrencyManager;

public void ConnectChartToTable()

{

     myCurrencyManager = (CurrencyManager)this.BindingContext[sourceTable];

     singleRecordSource1.RecordCurrency=myCurrencyManager;

     tChart1[0].CheckDataSource();

}

表单（和图表）可以通过CurrencyManager来进行检索。

    private void MovePrevious()

    {

 ;     if (myCurrencyManager.Position>0)

      {

        myCurrencyManager.Position=myCurrencyManager.Position+1;

        tChart1[0].CheckDataSource();

      }

    }

    private void MoveNext()

    {

      if (myCurrencyManager.Position<myCurrencyManager.Count)

      {

 &nbsp;      myCurrencyManager.Position=myCurrencyManager.Position+1;

    &nbsp;  ; tChart1[0].CheckDataSource();

      }

    }