c# - 我们可以将 objectdatasource 控件分配给数据集吗？

Question

我有两个问题：

1. 我们可以将 objectdatasource 控件分配给数据集吗？
2. 我们可以使用对象数据源控件将两个或多个表返回到 gridview 或 detailsview。

我的主要关注点是我必须将对象数据源存储在数据集中，否则我的应用程序将需要进行大量更改。

Answer 1

“ObjectDataSource”没有数据。他只是简单的返回一个方法的结果，这个方法应该返回一个IEnumerable。IEnumerable 可以是 POCO、String、Int32 等。

如何将对象数据源控件数据存储到数据集中

如果您返回“System.Data.DataTable”，然后，是的，在这种情况下，您可以将其存储在“System.Data.DataSet”中。但对我来说，意义不大。

Answer 2

1 是的，您可以将 objectdatasource 分配给 DataSet

private DataSet GetDataSet(ObjectDataSource ods)
{
var ds = new DataSet();
var dv = (DataView)ods.Select();
if (dv != null && dv.Count > 0)
{
var dt = dv.ToTable();
ds.Tables.Add(dt);
}
return ds;
}

2 是的，您可以返回很多表，但是当您绑定时，您需要指定索引表。

GridView1.DataSource = YourDataSet.Tables[0];
GridView2.DataSource = YourDataSet.Tables[2];

Answer 3

private void Form5_Load(object sender, EventArgs e)
{
    // Creating and configuring the ObjectDataSource component:
    var objectDataSource = new Telerik.Reporting.ObjectDataSource();
    objectDataSource.DataSource = GetAllData(); // GetData returns a DataSet with three tables
    objectDataSource.DataMember = "Product"; /// Indicating the exact table to bind to. If the DataMember is not specified the first data table will be used.
    objectDataSource.CalculatedFields.Add(new Telerik.Reporting.CalculatedField("FullName", typeof(string), "=Fields.Name + ' ' + Fields.ProductNumber")); // Adding a sample calculated field.

    // Creating a new report
    Telerik.Reporting.Report report = new Telerik.Reporting.Report();

    // Assigning the ObjectDataSource component to the DataSource property of the report.
    report.DataSource = objectDataSource;

    // Use the InstanceReportSource to pass the report to the viewer for displaying
    Telerik.Reporting.InstanceReportSource reportSource = new Telerik.Reporting.InstanceReportSource();
    reportSource.ReportDocument = report;

    // Assigning the report to the report viewer.
    reportViewer1.ReportSource = reportSource;

    // Calling the RefreshReport method (only in WinForms applications).
    reportViewer1.RefreshReport();
}

static DataSet GetAllData()
{
    const string connectionString =
        "Data Source=(local)\\SQLEXPRESS;Initial Catalog=AdventureWorks;Integrated Security=True";

    string selectCommandText = "SELECT Name, ProductCategoryID FROM Production.ProductCategory;" +
        "SELECT Name, ProductCategoryID FROM Production.ProductSubcategory;" +
        "SELECT Name, ProductNumber FROM Production.Product;";

    SqlDataAdapter adapter = new SqlDataAdapter(selectCommandText, connectionString);
    DataSet dataSet = new DataSet();

    // The data set will be filled with three tables: ProductCategory, ProductSubcategory 
    // and Product as the select command contains three SELECT statements.
    adapter.Fill(dataSet);

    // Giving meaningful names for the tables so that we can use them later.
    dataSet.Tables[0].TableName = "ProductCategory";
    dataSet.Tables[1].TableName = "ProductSubcategory";
    dataSet.Tables[2].TableName = "Product";
    return dataSet;
}