asp.net图书借阅管理图书借阅和归还代码实现

以下是一个简单的ASP.NET图书借阅管理系统的借阅和归还代码实现：

1. 创建一个名为“Book”的类来表示图书信息，包括书名、作者、ISBN号、是否在库等属性。

public class Book
{
    public string Title { get; set; }
    public string Author { get; set; }
    public string ISBN { get; set; }
    public bool IsAvailable { get; set; }
}

2. 在ASP.NET页面上创建两个GridView控件，一个用于显示所有可用的图书，另一个用于显示已借出的图书。

<asp:GridView ID="AvailableBooksGridView" runat="server" AutoGenerateColumns="False">
    <Columns>
        <asp:BoundField DataField="Title" HeaderText="Title" />
        <asp:BoundField DataField="Author" HeaderText="Author" />
        <asp:BoundField DataField="ISBN" HeaderText="ISBN" />
        <asp:TemplateField HeaderText="Action">
            <ItemTemplate>
                <asp:Button ID="BorrowButton" runat="server" Text="Borrow" CommandName="Borrow" CommandArgument="<%# Container.DataItemIndex %>" Enabled="<%# Eval("IsAvailable") %>" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

<asp:GridView ID="BorrowedBooksGridView" runat="server" AutoGenerateColumns="False">
    <Columns>
        <asp:BoundField DataField="Title" HeaderText="Title" />
        <asp:BoundField DataField="Author" HeaderText="Author" />
        <asp:BoundField DataField="ISBN" HeaderText="ISBN" />
        <asp:TemplateField HeaderText="Action">
            <ItemTemplate>
                <asp:Button ID="ReturnButton" runat="server" Text="Return" CommandName="Return" CommandArgument="<%# Container.DataItemIndex %>" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

3. 在页面的代码后端，创建一个列表来存储所有的图书信息，并将其绑定到可用图书的GridView上。

public List<Book> Books = new List<Book>()
{
    new Book() { Title = "The Catcher in the Rye", Author = "J.D. Salinger", ISBN = "0316769487", IsAvailable = true },
    new Book() { Title = "To Kill a Mockingbird", Author = "Harper Lee", ISBN = "0446310786", IsAvailable = true },
    new Book() { Title = "1984", Author = "George Orwell", ISBN = "0451524934", IsAvailable = true },
    new Book() { Title = "Animal Farm", Author = "George Orwell", ISBN = "0452284244", IsAvailable = true },
    new Book() { Title = "The Great Gatsby", Author = "F. Scott Fitzgerald", ISBN = "0743273567", IsAvailable = true }
};

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        AvailableBooksGridView.DataSource = Books.Where(b => b.IsAvailable).ToList();
        AvailableBooksGridView.DataBind();
        BorrowedBooksGridView.DataSource = Books.Where(b => !b.IsAvailable).ToList();
        BorrowedBooksGridView.DataBind();
    }
}

4. 在GridView的BorrowButton和ReturnButton的Click事件中，更新相应图书的IsAvailable属性，并重新绑定可用图书和已借出图书的GridView。

protected void AvailableBooksGridView_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName == "Borrow")
    {
        int index = Convert.ToInt32(e.CommandArgument);
        Books[index].IsAvailable = false;
        AvailableBooksGridView.DataSource = Books.Where(b => b.IsAvailable).ToList();
        AvailableBooksGridView.DataBind();
        BorrowedBooksGridView.DataSource = Books.Where(b => !b.IsAvailable).ToList();
        BorrowedBooksGridView.DataBind();
    }
}

protected void BorrowedBooksGridView_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName == "Return")
    {
        int index = Convert.ToInt32(e.CommandArgument);
        Books[index].IsAvailable = true;
        AvailableBooksGridView.DataSource = Books.Where(b => b.IsAvailable).ToList();
        AvailableBooksGridView.DataBind();
        BorrowedBooksGridView.DataSource = Books.Where(b => !b.IsAvailable).ToList();
        BorrowedBooksGridView.DataBind();
    }
}

这样，就可以实现一个简单的ASP.NET图书借阅管理系统的借阅和归还功能。