如何使用实体框架C＃将两个表绑定到Datagridview

Question

I have two Tables Estate and EstateType. How to bind those two tables to one data grid? I tried something like this but this doesn't work.

 var getAllEst = (from ee in AgencyContext.Estate join eeT in AgencyContext.EstateType
                         on ee.EstateID equals eeT.EstateID select ee).ToList();

dataGridView1.DataSource = getAllEst;

Instead of string values EstateType, Landscape, Description it gives me numbers

As suggested @tpayne84 I'm added new columns but now I get this instead of values:

This is the code I used:

var getAllEst = (from ee in AgencyContext.Estate join eeT in AgencyContext.EstateType
                         on ee.EstateID equals eeT.EstateID select ee).ToList();
        DataGridViewTextBoxColumn EstateType1 = new DataGridViewTextBoxColumn();
        DataGridViewTextBoxColumn LandScape1 = new DataGridViewTextBoxColumn();
        DataGridViewTextBoxColumn Description1 = new DataGridViewTextBoxColumn();
        EstateType1.DataPropertyName = "EstateType";
        LandScape1.DataPropertyName = "LandScape";
        Description1.DataPropertyName = "Discription";
        dataGridView1.Columns.Add(EstateType1);
        dataGridView1.Columns.Add(LandScape1);
        dataGridView1.Columns.Add(Description1);
        dataGridView1.DataSource = getAllEst;

Answer 1

The problem looks like you are displaying the Foreign Key ID of the referenced object instead of the Property on the Object that you wish to display.

This happens because you are allowing the DataGridView to generate your columns for you.

To remedy this, you will need to create the columns yourself:

DataGridViewTextBoxColumn nameColumn = new DataGridViewTextBoxColumn();
// Where "Name" is the String representation of the Property on the
// Object that you want to display.
nameColumn.DataPropertyName = "Name";

Answer 2

First of all, your query

 var getAllEst = (from ee in AgencyContext.Estate join eeT in AgencyContext.EstateType on ee.EstateID equals eeT.EstateID select ee).ToList(); 

will only select AgencyContext.Estate objects that have an associated EstateType using an inner join...unless your Estate class has some navigation property to the EstateType . If you have something like:

class Estate
{
    // ...other properties

    // I'm guessing the relationship here...
    public virtual EstateType EstateType { get; set; } 
}

then you would be able to access the EstateType properties through that property.

Unfortunately, DataGridView doesn't seem to support binding to child properties so you wouldn't be able to set column.DataPropertyName = EstateType.SomeProperty , but you could work around that by overriding EstateType.ToString() or handling the CellFormatting event on the DataGridView .