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This article is about how to use the ADO.NET class. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

ADO.NET is divided into two categories: simple data binding and complex data binding. The composition of these two classes greatly improves productivity, similar to the way that components suitable for complex data binding implement data binding for the use of technicians.

It is just that when components are bound to data, some components with more complex structure have similar operation steps at data binding time, while other components with simpler structure are similar in data binding. As a result, there are two categories. The following discusses the function and concrete implementation method of ADO.NET class in realizing simple data binding and complex data binding by combining TextBox component and DataGrid component respectively.

1. Simple data binding:

Simple data binding generally uses the Add method of the DataBindings attribute in these components to bind a row in a DataTable in DataSet to a property of the component, so as to achieve the effect of displaying data. The specific implementation of the data binding of the TextBox component is to add the code in listing 03 after listing 01. The code in listing 03 binds the data of "CustomerID" in the Customers data table in the ADO.NET class to the Text property of TextBox, so that DbTextBox is generated. Other methods for data binding of simple data binding components are similar to this:

Code listing 03:

TextBox1.DataBindings.Add ("Text", dsDataSet1, "Customers. CustomerID")

two。 Complex data binding:

Complex data binding generally completes data binding by setting the DataSource property and DisplayMember property of the component. The value of the DataSource property is generally set to the value of the DataSet,DisplayMember property to bind. It is generally set to a data table or a column in the data table to be bound. The general implementation of data binding for DataGrid components is to add the code in listing 04 to the ADO.NET class after listing 01. The function of listing 04 is to bind the Customers data table in DataSet to DataGrid. Other components suitable for complex data binding implement data binding in a way similar to this:

Code listing 04:

DataGrid1.DataSource = dsDataSet1; dataGrid1.DataMember = "Customers"

The ADO.NET class is a very important core member of ADO.NET, which is a cache of data in the database mapped to the local computer. Any operation on DataSet is done in the computer cache. Understanding this is a step to mastering DataSet. Although the structure of DataSet is complex. However, it is not too difficult to master as long as you distinguish the components of the DataSet object and their relationships.

Thank you for reading! This is the end of this article on "how to use the ADO.NET class". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!

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