在另一個組合框更改選定值時設置ComboBox選定項c＃

Question

class ComboBoxCompany
{
    public string Code;
    public string Name;
    public string Database;

    public ComboBoxCompany(string code, string name, string database)
    {
        Code = code;  Name = name; Database = database;
    }

    public override string ToString()
    {
        // Generates the text shown in the combo box
        return Name;
    }
}

class ComboBoxDatabase
{
    public string cmpName;
    public string dbName;

    public ComboBoxDatabase(string cmpname, string dbname)
    {
        cmpName = cmpname; dbName = dbname;
    }

    public override string ToString()
    {
        // Generates the text shown in the combo box
        return cmpName + " - " + dbName;
    }
}

這些是2個組合框的類，因此當我選擇第一個組合框（ComboBoxCompany）的值時，我希望第二個組合框（ComboBoxDatabase）從第一個組合框“ Database” -Value中選擇“ dbName” -Value

我試過了，但是沒有

    private void cbxBranch_SelectedIndexChanged(object sender, EventArgs e)
    {
        cbxDatabase.SelectedItem = (cbxCompany.SelectedItem as ComboBoxCompany).Database;
    }

Answer 1

通過設置(cbxCompany.SelectedItem as ComboBoxCompany).Database您嘗試將所選項目設置為不“存在”的數據庫字符串，因為似乎您添加了一個類作為comboboxitem。

您需要將SelectedItem設置為真實對象。 您可以使用linq（示例代碼）進行搜索：

var company = cbxCompany.SelectedItem as ComboBoxCompany;
if(company == null)
   return;
var dbItem = _databaseComboBoxItems.FirstOrDefault(x=>x.CompanyName = company.CompanyName && x.Database == company.DatabaseName);
if(dbItem == null)
  return;
 cbxDatabase.SelectedItem = dbItem;