用户输入时无法设置组合选择的索引

时间:2013-01-01 17:50:59

标签: c# winforms combobox selectedindex

我有一个带有数据绑定组合框的表单,dropstyle设置为下拉列表,因此用户可以键入组合框。

我的问题是,当用户键入组合框并且键入的值匹配绑定到组合框的其中一个值时,即使我也尝试过,它也不会更改selectedindex。相反,它将所选索引设置为-1(因此所选值为null)。

有人可以帮忙吗?这是我的代码(我的尝试之一,我尝试了其他方法,但没有帮助)。

private void setCombo()
{
        comboFromOther.DisplayMember = "tbl10_KupaID";
        comboFromOther.ValueMember = "tbl10_KupaID";
        comboFromOther.DataSource = dsKupotGemel.Tables[0];
}

private void comboToOther_TextChanged(object sender, EventArgs e)
{
        comboDetail = changedComboText(2, comboToOther.Text);
        textToOther.Text = comboDetail[0];
        if (comboDetail[0] == "")
        {

        }
        else
        {
            comboToOther.SelectedIndex = System.Int32.Parse(comboDetail[1]);
            comboToOther.SelectedValue = System.Int32.Parse(comboDetail[2]);
        } 
    }

    private string[] changedComboText(int iComboType, string comboString)
    {
        if (groupCalculate.Visible == true)
        {
            groupCalculate.Visible = false;
        }
        string[] kupaDetail = new string[3];
        kupaDetail[0] = "";
        kupaDetail[1] = "";
        kupaDetail[2] = "";
        for (int i = 0; i <= dsKupotGemel.Tables[0].Rows.Count - 1; i++)
        {
           if (comboString == dsKupotGemel.Tables[0].Rows[i][0].ToString())
           {
                 kupaDetail[0] = dsKupotGemel.Tables[0].Rows[i][1].ToString();
                 kupaDetail[1] = i.ToString();
                 kupaDetail[2] = comboString;
                 break;
           }
           else
           {

           }
        }
   return kupaDetail;
}

1 个答案:

答案 0 :(得分:0)

您的代码中可能存在错误?

以下是一份工作样本:

// Fields
private const string NameColumn = "Name";
private const string IdColumn = "ID";

private DataTable table;

接下来,初始化

// Data source
table = new DataTable("SomeTable");
table.Columns.Add(NameColumn, typeof(string));
table.Columns.Add(IdColumn, typeof(int));

table.Rows.Add("First", 1);
table.Rows.Add("Second", 2);
table.Rows.Add("Third", 3);
table.Rows.Add("Last", 4);

// Combo box:
this.comboBox1.DisplayMember = NameColumn;
this.comboBox1.ValueMember = IdColumn;
this.comboBox1.DataSource = table;
this.comboBox1.DropDownStyle = ComboBoxStyle.DropDown;
this.comboBox1.TextChanged += comboBox1_TextChanged;
this.comboBox1.SelectedIndexChanged += this.comboBox1_SelectedIndexChanged;

事件处理程序 - TextChanged:

private void comboBox1_TextChanged(object sender, EventArgs e)
{
    for (int i = 0; i < table.Rows.Count; i++)
    {
        if (table.Rows[i][NameColumn].ToString() == this.comboBox1.Text)
        {
            this.comboBox1.SelectedValue = table.Rows[i][IdColumn];
            break;
        }
    }
}

事件处理程序 - SelectedIndexChanged:

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    // Do here what is required
}

使用此代码,只要用户在项目框中键入项目的全名,就会通过TextChanged调用SelectedIndexChanged。

还有AutoCompleteModeAutoCompleteSource之类的东西。不知道它们适合您的应用程序。