使用未定义的Dictionary< Type，Type>作为方法的输入

本文介绍了使用未定义的Dictionary< Type，Type>作为方法的输入的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试定义一种用于在Windows窗体上填充ComboBox控件的通用方法.我通常使用Dictionary通过将组合框绑定到数据源来填充组合框.由于只有少数几个，因此我想创建一种方法，可以仅对键，值对的任意组合进行调用.这是我的尝试:

I am trying to define a generic method for populating ComboBox controls on Windows Forms. I am usually using Dictionary to populate my combo boxes by binding them to the Data Source. Since I have a handful of those, I wanted to make a method that I can just call on any combination of a key, value pairs. Here's my attempt:

private void PopulateDropdown(ComboBox control, Dictionary<Type, Type> dict) { if (dict.Count > 0) { control.DataSource = new BindingSource(dict, null); control.DisplayMember = "Key"; control.ValueMember = "Value"; } }

我希望能够这样称呼它:

I would like to be able to call it like so:

PopulateDropdown(cbPrinters, this.inputData.Printers);其中， this.inputData.Printers是字典，键/值类型为字符串，字符串，但是我还有其他组合，例如字符串，整数或字符串，对象.

PopulateDropdown(cbPrinters, this.inputData.Printers); where this.inputData.Printers is a Dictionary with key/value types as string, string but I also have other combinations like string, int or string,object.

我遇到了无法将字符串，字符串转换为Type，Type的错误.我怎样才能解决这个问题?

I am getting an error that cannot convert string, string to Type, Type. How can I fix this?

推荐答案

您需要使用通用参数声明方法:

You need to declare your method with generic parameters:

private void PopulateDropdown<TKey,TValue>(ComboBox control, Dictionary<TKey, TValue> dict) { }