frmcontent.vb

地理信息系统二次开发实例教程VB.NET及源代码

Public Class frmContent
    Inherits System.Windows.Forms.Form

    Dim _env As CEnvironment = Nothing
    Dim _szName As String  ' 地物名称


#Region " Windows 窗体设计器生成的代码 "
    '---------------------------------------------------------------------
    Public Sub New(ByVal env As CEnvironment)
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 调用之后添加任何初始化
        _env = env
    End Sub
    '---------------------------------------------------------------------
    '窗体重写处置以清理组件列表。
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    '注意：以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Friend WithEvents _listBox As System.Windows.Forms.ListBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me._listBox = New System.Windows.Forms.ListBox()
        Me.SuspendLayout()
        '
        '_listBox
        '
        Me._listBox.Dock = System.Windows.Forms.DockStyle.Fill
        Me._listBox.ItemHeight = 12
        Me._listBox.Name = "_listBox"
        Me._listBox.Size = New System.Drawing.Size(292, 268)
        Me._listBox.TabIndex = 2
        '
        'frmContent
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me._listBox})
        Me.Name = "frmContent"
        Me.Text = "详细信息"
        Me.ResumeLayout(False)

    End Sub

#End Region
    '---------------------------------------------------------------------
    Private Sub frmContent_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
        If "" = _szName Then
            Return
        End If

        Dim szTableName As String = _env.GetTableName(_szName, "地名索引")
        If "" = szTableName Then
            MessageBox.Show("属性库中无此地名！", "北京市地理信息公众查询系统", MessageBoxButtons.OK, MessageBoxIcon.Error)
            Return
        End If

        _listBox.Items.Clear()
        Dim strConnectionString As String
        strConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + _
                              _env.m_szDBName + ";Persist Security Info=False"
        Dim myConnection As New System.Data.OleDb.OleDbConnection(strConnectionString)
        myConnection.Open()
        Dim dataSet As New System.Data.DataSet("临时库")
        Dim myDataAdapter As System.Data.OleDb.OleDbDataAdapter

        Dim szSQL As String
        Dim szFieldName As String
        szFieldName = _env.GetFieldName(_szName)

        If szFieldName = "" Then
            szFieldName = "单位名称"
        End If

        szSQL = "Select * From [" + szTableName + "] Where " + _
                szFieldName + " ='" + _szName + "'"
        myDataAdapter = New System.Data.OleDb.OleDbDataAdapter(szSQL, myConnection)

        Try
            myDataAdapter.Fill(dataSet, "地名")
        Finally
        End Try

        Dim indexTbl As System.Data.DataTable = dataSet.Tables("地名")
        Dim rowsType As System.Data.DataRow() = indexTbl.Select()

        If 0 = rowsType.Length Then
            Return
        End If

        Dim i As Integer
        For i = 0 To indexTbl.Columns.Count - 1
            Dim szValue As String
            szValue = indexTbl.Columns(i).ColumnName + ":" + rowsType(0)(i).ToString()
            _listBox.Items.Add(szValue)
        Next
    End Sub
    '---------------------------------------------------------------------
    Public Sub SetName(ByVal szName As String)
        _szName = szName
    End Sub
    '---------------------------------------------------------------------
End Class