c#组合框绑定到对象列表 [英] c# combobox binding to list of objects

问题描述

是否可以将 ComboBox 绑定到对象列表，但是 selectedvalue 属性指向对象，而不是对象的属性?

Is it possible to bind a ComboBox to a list of objects, but have the selectedvalue property point to the object, not a property of the object?

我之所以这么问，是因为我们有一些业务对象引用了其他对象 - 例如年份"对象.可能需要将那个年份对象切换为另一个年份对象.

I only ask because we have some Business Objects which have references to other objects - such as a 'Year' object. That year object may need to be switched out for another year object.

我能想到的唯一解决方案是让另一个具有单个属性的类，在这种情况下指向一个 year 对象.然后将组合框绑定到这些列表并将显示成员和值成员设置为单个属性.

Only solution I can come up with is to have another class with a single property, in this case pointing to a year object. then bind the combobox to a List of these and set both the display and value members to the single property.

但是对我们的任何查找"这样做似乎有点痛苦??

But doing that for any 'lookups' we have seems like a bit of a pain??

推荐答案

如果您将 ValueMember 设置为 null，则所选值将始终是对象，而不是属性:

If you set the ValueMember to null the selected value will always be the object, not a property:

{
    public class TestObject
    {
        public string Name { get; set; }
        public int Value { get; set; }
    }
    public partial class Form1 : Form
    {
        private System.Windows.Forms.ComboBox comboBox1;

        public Form1()
        {
            this.comboBox1 = new System.Windows.Forms.ComboBox();
            this.SuspendLayout();
            // 
            // comboBox1
            // 
            this.comboBox1.FormattingEnabled = true;
            this.comboBox1.Location = new System.Drawing.Point(23, 13);
            this.comboBox1.Name = "comboBox1";
            this.comboBox1.Size = new System.Drawing.Size(121, 21);
            this.comboBox1.TabIndex = 0;
            this.comboBox1.SelectedValueChanged += new System.EventHandler(this.comboBox1_SelectedValueChanged);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 262);
            this.Controls.Add(this.comboBox1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);

            BindingList<TestObject> objects = new BindingList<TestObject>();
            for (int i = 0; i < 10; i++)
            {
                objects.Add(new TestObject() { Name = "Object " + i.ToString(), Value = i });
            }
            comboBox1.ValueMember = null;
            comboBox1.DisplayMember = "Name";
            comboBox1.DataSource = objects;
        }

        private void comboBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            if (comboBox1.SelectedValue != null)
            {
                TestObject current = (TestObject)comboBox1.SelectedValue;
                MessageBox.Show(current.Value.ToString());
            }
        }
    }
}

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