无法绑定到DataSource上的属性或列"列名称".参数名称:dataMember

Question

我有2个DTO课程:

public class AddressDto
{
    public string Street { get; set; }
    public string City { get; set; }
    public string PostCode { get: set: }
}

public class CustomerDto
{
    public int Number{ get; set; }
    public string Name { get; set; }
    public AddressDto Address { get: set: }

    public CustomerDto() 
    {
        Address = new AddressDto();
    }
}

我有一个带有绑定源的表单,它绑定到CustomerDto.我还有一个带有地址字段的自定义控件.此自定义控件具有绑定到AddressDto的绑定源控件的文本框正确绑定到地址属性.

该控件公开以下属性:

[Bindable(BindableSupport.Yes, BindingDirection.TwoWay)]
[Browsable(false)]
public object Address
{
    get { return bindingSource.DataSource; }
    set { bindingSource.DataSource = value; }
}

在一台机器上我没有任何错误CheckBinding().但是在另一台机器上,当我尝试在运行时打开表单时,我得到了上述异常.在设计时,一切正常.

控件有3 TextBoxes,设计器添加以下绑定:

this.bindingSource.AllowNew = true;
this.bindingSource.DataSource = typeof(AddressDto);

this.txtStreet.DataBindings.Add(new Binding("Text", this.bindingSource, "Street", true));
this.txtCity.DataBindings.Add(new Binding("Text", this.bindingSource, "City", true));
this.txtPostCode.DataBindings.Add(new Binding("Text", this.bindingSource, "PostCode", true));

问题可以解决的任何想法？

Answer 1

我将代码更改为:

    [Bindable(BindableSupport.Yes, BindingDirection.TwoWay)]
    [Browsable(false)]
    public object Address
    {
        get { return bindingSource.DataSource; }
        set 
        {
            if (value != null && value != System.DBNull.Value)
                bindingSource.DataSource = value;
            else
                bindingSource.DataSource = typeof(AddressDto);
        }
    }

价值是System.DBNull.通过上述更改,不再抛出异常.

这解决了这个问题.但是,为什么值DBNull仍然不明确,因为我使用纯POCO类作为我的绑定源的数据源.