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首先你得保证
DropDownStyle为DropDown，千万不要是DropDownList，这样会无法输入的。
然后确认接入了数据源，
接入了数据源是指：
using (var Context = new MyDbContext())
{
var GenreData = Context.Genres.OrderByDescending(x=>x.Id);
foreach(var item in GenreData)
{
comboBox1.Items.Add(item.Name);
}
comboBox1.SelectedIndex = 0;
}
最起码这样的。
在窗体初始化的构造方法里面写：
this.comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems; //设置自动完成的源
this.comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend; //设置自动完成的的形式
参考文档：
https://www.cnblogs.com/huangfr/archive/2011/09/07/2170387.html
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