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ComboBox.FindStringExact Method

Finds the item that exactly matches the specified string.

Overload List

Finds the first item in the combo box that matches the specified string.

[Visual Basic] Overloads Public Function FindStringExact(String) As Integer
[C#] public int FindStringExact(string);
[C++] public: int FindStringExact(String*);
[JScript] public function FindStringExact(String) : int;

Finds the first item after the specified index that matches the specified string.

[Visual Basic] Overloads Public Function FindStringExact(String, Integer) As Integer
[C#] public int FindStringExact(string, int);
[C++] public: int FindStringExact(String*, int);
[JScript] public function FindStringExact(String, int) : int;

Example

The following code example demonstrates using the FindStringExact methods. To run the example, paste the following code in a form that contains a TextBox named TextBox1 and call the InitializeComboBox method from the form's constructor or Load method.

[SampleID='System.Windows.Forms.ComboBoxFindString' SnippetID='1,2']
--------- Languages displayed= cs, vb ---------
--------- cs ---------
--------- Snippet 1 ---------
    // Declare comboBox1 as a ComboBox.
    internal System.Windows.Forms.ComboBox ComboBox1;
    
    // This method initializes the combo box, adding a large string array
    // but limiting the drop-down size to six rows so the combo box doesn't 
    // cover other controls when it expands.
    private void InitializeComboBox()
    {
        this.ComboBox1 = new System.Windows.Forms.ComboBox();
        string[] employees = new string[]{"Hamilton, David", "Hensien, Kari",
                "Hammond, Maria", "Harris, Keith", "Henshaw, Jeff D.", 
                "Hanson, Mark", "Harnpadoungsataya, Sariya", 
                "Harrington, Mark", "Harris, Keith", "Hartwig, Doris", 
                "Harui, Roger", "Hassall, Mark", "Hasselberg, Jonas", 
                "Harnpadoungsataya, Sariya", "Henshaw, Jeff D.", 
                "Henshaw, Jeff D.", "Hensien, Kari", "Harris, Keith", 
                "Henshaw, Jeff D.", "Hensien, Kari", "Hasselberg, Jonas",
                "Harrington, Mark", "Hedlund, Magnus", "Hay, Jeff", 
                "Heidepriem, Brandon D."};
        ComboBox1.Items.AddRange(employees);
        this.ComboBox1.Location = new System.Drawing.Point(136, 32);
        this.ComboBox1.MaxDropDownItems = 5;
        this.ComboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
        this.ComboBox1.Name = "ComboBox1";
        this.ComboBox1.Size = new System.Drawing.Size(136, 81);
        this.ComboBox1.TabIndex = 0;
        this.Controls.Add(this.ComboBox1);
        
        // Associate the event-handling method with the 
        // SelectedIndexChanged event.
        this.ComboBox1.SelectedIndexChanged += 
            new System.EventHandler(ComboBox1_SelectedIndexChanged);
    }
--------- Snippet 2 ---------
    // This method is called when the user changes his or her selection.
    // It searches for all occurrences of the selected employee's
    // name in the Items array and adds the employee's name and 
    // the number of occurrences to TextBox1.Text.
    // CAUTION   This code exposes a known bug: If the index passed to the 
    // FindStringExact(searchString, index) method is the last index 
    // of the array, the code throws an exception.
    private void ComboBox1_SelectedIndexChanged(object sender, 
        System.EventArgs e)
    {
        ComboBox comboBox = (ComboBox) sender;
        // Save the selected employee's name, because we will remove
        // the employee's name from the list.
        string selectedEmployee = (string) ComboBox1.SelectedItem;
        int count = 0;
        int resultIndex = -1;
        // Call the FindStringExact method to find the first 
        // occurrence in the list.
        resultIndex = ComboBox1.FindStringExact(selectedEmployee);
        // Remove the name as it is found, and increment the found count. 
        // Then call the FindStringExact method again, passing in the 
        // index of the current found item so the search starts there 
        // instead of at the beginning of the list.
        while (resultIndex!=-1)
        {
            ComboBox1.Items.RemoveAt(resultIndex);
            count += 1;
            resultIndex = ComboBox1.FindStringExact(selectedEmployee, 
                resultIndex);
        }
        // Update the text in Textbox1.
        TextBox1.Text = TextBox1.Text+ "\r\n" + selectedEmployee + ": "
            + count;
    }
--------- vb ---------
--------- Snippet 1 ---------
    ' Declare comboBox1 as a ComboBox.
    Friend WithEvents ComboBox1 As System.Windows.Forms.ComboBox
    ' This method initializes the combo box, adding a large string 
    ' array but limiting the drop-down size to six rows so the combo box
    ' doesn't cover other controls when it expands.
    Private Sub InitializeComboBox()
        Me.ComboBox1 = New System.Windows.Forms.ComboBox
        Dim employees() As String = New String() {"Hamilton, David", _
            "Hensien, Kari", "Hammond, Maria", "Harris, Keith", _
            "Henshaw, Jeff D.", "Hanson, Mark", "Harnpadoungsataya, Sariya", _
            "Harrington, Mark", "Harris, Keith", "Hartwig, Doris", _
            "Harui, Roger", "Hassall, Mark", "Hasselberg, Jonas", _
            "Harnpadoungsataya, Sariya", "Henshaw, Jeff D.", "Henshaw, Jeff D.", _
            "Hensien, Kari", "Harris, Keith", "Henshaw, Jeff D.", _
            "Hensien, Kari", "Hasselberg, Jonas", "Harrington, Mark", _
            "Hedlund, Magnus", "Hay, Jeff", "Heidepriem, Brandon D."}
        ComboBox1.Items.AddRange(employees)
        Me.ComboBox1.Location = New System.Drawing.Point(136, 32)
        Me.ComboBox1.MaxDropDownItems = 5
        Me.ComboBox1.DropDownStyle = ComboBoxStyle.DropDown
        Me.ComboBox1.Name = "ComboBox1"
        Me.ComboBox1.Size = New System.Drawing.Size(136, 81)
        Me.ComboBox1.TabIndex = 0
        Me.Controls.Add(Me.ComboBox1)
    End Sub
--------- Snippet 2 ---------
    ' This method is called when the user changes his or her selection.
    ' It searches for all occurrences of the selected employee's
    ' name in the Items array and adds the employee's name and 
    ' the number of occurrences to TextBox1.Text.
    ' CAUTION   This code exposes a known bug: If the index passed to the 
    ' FindStringExact(searchString, index) method is the last index 
    ' of the array, the code throws an exception.
    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        Dim comboBox As comboBox = CType(sender, comboBox)
        ' Save the selected employee's name, because we will remove
        ' the employee's name from the list.
        Dim selectedEmployee = CType(ComboBox1.SelectedItem, String)
        Dim count As Integer = 0
        Dim resultIndex As Integer = -1
        ' Call the FindStringExact method to find the first 
        ' occurrence in the list.
        resultIndex = ComboBox1.FindStringExact(ComboBox1.SelectedItem)
        ' Remove the name as it is found, and increment the found count. 
        ' Then call the FindStringExact method again, passing in the index of the
        ' current found item so the search starts there instead of 
        ' at the beginning of the list.
        While (resultIndex <> -1)
            ComboBox1.Items.RemoveAt(resultIndex)
            count += 1
            resultIndex = ComboBox1.FindStringExact _
            (selectedEmployee, resultIndex)
        End While
        ' Update the text in Textbox1.
        TextBox1.Text = TextBox1.Text & Microsoft.VisualBasic.vbCrLf _
            & selectedEmployee & ": " & count
   End Sub

See Also

ComboBox Class | ComboBox Members | System.Windows.Forms Namespace

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