C#,Winform中为什么设置DataGridViewComboBoxColumn.DisplayMember时会提示出错"未将对象引用设置到对象的实例"
public Entities.TList<Entities.Products> ProductIdList
{
get {return this._ProductIdList;}
set
{
this._ProductIdList = value;
this.uxProductIdDataGridViewColumn.DataSource = null;
this.uxProductIdDataGridViewColumn.DisplayMember = "ProductName";//这句出错：“未将对象引用设置到对象的实例”，明明:uxProductIdDataGridViewColumn.DisplayMember 值是看的到是为""
this.uxProductIdDataGridViewColumn.ValueMember = "ProductId";
this.uxProductIdDataGridViewColumn.DataSource = this._ProductIdList;
}
}
//========请高手指点一二!
[解决办法]
你试一试这样写：
public Entities.TList <Entities.Products > ProductIdList
{
get {return this._ProductIdList;}
set
{
this._ProductIdList = value;
this.uxProductIdDataGridViewColumn.DataSource = this._ProductIdList;
this.uxProductIdDataGridViewColumn.DisplayMember = "ProductName";
this.uxProductIdDataGridViewColumn.ValueMember = "ProductId";
}
}
[解决办法]
要先设数据源,再操作显示,this.uxProductIdDataGridViewColumn.DataSource =null
为空,当然会错了
