当另一个组合框更改所选值时，设置ComboBox所选项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;
    }
}

这些是2个组合框的类，所以当我选择第一个组合的值时（ComboBoxCompany），我希望第二个组合框（ComboBoxDatabase）从第一个组合框“数据库”中选择“dbName”-Value - 值

我试过这个，但它没有

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

Answer 1

通过设置 (cbxCompany.SelectedItem as ComboBoxCompany).Database 您尝试将所选项目设置为不存在的数据库字符串，因为您似乎添加了一个类作为组合框架。

您需要将SelectedItem设置为真实对象。您可以使用linq（示例代码）搜索此内容：

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;