Datatables .NET（開発者にとっての動作方法）

public class Product
{
    public int Id { get; set; }
    public string ProductName { get; set; } = string.Empty;
    public string ProductPrice { get; set; } = string.Empty;
    public string ProductWeight { get; set; } = string.Empty;
    public string ProductDescription { get; set; } = string.Empty;
    public DateTime ProductManufacturingDate { get; set; }
    public DateTime ProductExpiryDate { get; set; }
}

Public Class Product
	Public Property Id() As Integer
	Public Property ProductName() As String = String.Empty
	Public Property ProductPrice() As String = String.Empty
	Public Property ProductWeight() As String = String.Empty
	Public Property ProductDescription() As String = String.Empty
	Public Property ProductManufacturingDate() As DateTime
	Public Property ProductExpiryDate() As DateTime
End Class

public class ApplicationDBContext : DbContext
{
    public ApplicationDBContext(DbContextOptions<ApplicationDBContext> options) : base(options)
    {
    }
    public DbSet<Product> Products { get; set; }
}

Public Class ApplicationDBContext
	Inherits DbContext

	Public Sub New(ByVal options As DbContextOptions(Of ApplicationDBContext))
		MyBase.New(options)
	End Sub
	Public Property Products() As DbSet(Of Product)
End Class

//add advanced interaction controls
$(document).ready(function () {
    $("#productDatatable").DataTable({
        "processing": true,
        "serverSide": true,
        "filter": true,
        "ajax": {
            "url": "/api/Product",
            "type": "POST",
            "datatype": "json"
        },
        "columnDefs": [{
            "targets": [0].data,
            "visible": false,
            "searchable": false
        }],
        "columns": [
            { "data": "id", "name": "Id", "autoWidth": true },
            { "data": "productName", "name": "ProductName", "autoWidth": true },
            { "data": "productPrice", "name": "ProductPrice", "autoWidth": true },
            { "data": "productWeight", "name": "ProductWeight", "autoWidth": true },
            { "data": "productDescription", "name": "ProductDescription", "autoWidth": true },
            { "data": "productManufacturingDate", "name": "ProductManufacturingDate", "autoWidth": true },
            { "data": "productExpiryDate", "name": "ProductExpiryDate", "autoWidth": true },
            {
                "render": function (data, row) { return "<a href='#' class='btn btn-danger' onclick=DeleteProduct('" + row.id + "'); >Delete</a>"; }
            },
        ]
    });
});

'add advanced interaction controls
$(document).ready([function] () {
	$("#productDatatable").DataTable({
		"processing":= True, "serverSide":= True, "filter":= True, "ajax":= {
			"url":= "/api/Product",
			"type":= "POST",
			"datatype":= "json"
		},
		"columnDefs":= ({
			"targets":= (0).data,
			"visible":= False,
			"searchable":= False
		}), "columns":= ({
			"data":= "id",
			"name":= "Id",
			"autoWidth":= True
		},
		{
			"data":= "productName",
			"name":= "ProductName",
			"autoWidth":= True
		},
		{
			"data":= "productPrice",
			"name":= "ProductPrice",
			"autoWidth":= True
		},
		{
			"data":= "productWeight",
			"name":= "ProductWeight",
			"autoWidth":= True
		},
		{
			"data":= "productDescription",
			"name":= "ProductDescription",
			"autoWidth":= True
		},
		{
			"data":= "productManufacturingDate",
			"name":= "ProductManufacturingDate",
			"autoWidth":= True
		},
		{
			"data":= "productExpiryDate",
			"name":= "ProductExpiryDate",
			"autoWidth":= True
		},
		{
			"render":= [function] (data, row) { Return "<a href='#' class='btn btn-danger' onclick=DeleteProduct('" & row.id & "'); >Delete</a>"; }
		},
		)
}); })

//static HTML page
@page
@model IndexModel
@{
    ViewData ["Title"] = "Home page";
}
<link href="~/lib/datatables/css/dataTables.bootstrap4.min.css" rel="stylesheet" />
<div class="container">
    <br />
    <div style="width:90%; margin:0 auto;">
        <table id="productDatatable" class="table table-striped table-bordered dt-responsive nowrap" width="100%" cellspacing="0">
            <thead>
                <tr>
                    <th>Id</th>
                    <th>Product Name</th>
                    <th>Product Price</th>
                    <th>Product Weight</th>
                    <th>Product Description</th>
                    <th>Product Manufacturing Date</th>
                    <th>Product Expiry Date</th>
                    <th>Actions</th>
                </tr>
            </thead>
        </table>
    </div>
</div>
@section Scripts
{
    <script src="~/lib/datatables/js/jquery.dataTables.min.js"></script>
    <script src="~/lib/datatables/js/dataTables.bootstrap4.min.js"></script>
    <script src="~/js/ProductDatatable.js"></script>
}

'static HTML page
page model ReadOnly Property () As IndexModel
	ViewData ("Title") = "Home page"
End Property
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: <link href="~/lib/datatables/css/dataTables.bootstrap4.min.css" rel="stylesheet" /> <div class="container"> <br /> <div style="width:90%; margin:0 auto;"> <table id="productDatatable" class="table table-striped table-bordered dt-responsive nowrap" width="100%" cellspacing="0"> <thead> <tr> <th> Id</th> <th> Product Name</th> <th> Product Price</th> <th> Product Weight</th> <th> Product Description</th> <th> Product Manufacturing @Date</th> <th> Product Expiry @Date</th> <th> Actions</th> </tr> </thead> </table> </div> </div> @section Scripts
"100%" cellspacing="0"> (Of thead) (Of tr) (Of th) Id</th> (Of th) Product Name</th> (Of th) Product Price</th> (Of th) Product Weight</th> (Of th) Product Description</th> (Of th) Product Manufacturing [Date]</th> (Of th) Product Expiry [Date]</th> (Of th) Actions</th> </tr> </thead> </table> </div> </div> section Scripts
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: Friend <link href="~/lib/datatables/css/dataTables.bootstrap4.min.css" rel="stylesheet" /> <div Class="container"> <br /> <div style="width:90%; margin:0 auto;"> <table id="productDatatable" class="table table-striped table-bordered dt-responsive nowrap" width="100%" cellspacing
"table table-striped table-bordered dt-responsive nowrap" width="100%" cellspacing
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: Private Friend <link href="~/lib/datatables/css/dataTables.bootstrap4.min.css" rel="stylesheet" /> <div Class="container"> <br /> <div style="width:90%; margin:0 auto;"> <table id="productDatatable" class="table table-striped table-bordered dt-responsive nowrap" width
"productDatatable" class="table table-striped table-bordered dt-responsive nowrap" width
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: Private Private Friend <link href="~/lib/datatables/css/dataTables.bootstrap4.min.css" rel="stylesheet" /> <div Class="container"> <br /> <div style="width:90%; margin:0 auto;"> <table id="productDatatable" class
"width:90%; margin:0 auto;"> <table id="productDatatable" class
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: Private Private Private Friend <link href="~/lib/datatables/css/dataTables.bootstrap4.min.css" rel="stylesheet" /> <div Class="container"> <br /> <div style="width:90%; margin:0 auto;"> <table id
'INSTANT VB WARNING: Instant VB cannot determine whether both operands of this division are integer types - if they are then you should use the VB integer division operator:
"container"> <br /> <div style="width:90%; margin:0 auto;"> <table id
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: Private Private Private Private Friend <link href="~/lib/datatables/css/dataTables.bootstrap4.min.css" rel="stylesheet" /> <div Class="container"> <br /> <div style
'INSTANT VB WARNING: Instant VB cannot determine whether both operands of this division are integer types - if they are then you should use the VB integer division operator:
"stylesheet" /> <div Class="container"> <br /> <div style
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: Private Private Private Private Private Friend <link href="~/lib/datatables/css/dataTables.bootstrap4.min.css" rel="stylesheet" /> <div Class
"~/lib/datatables/css/dataTables.bootstrap4.min.css" rel="stylesheet" /> <div Class
Private Private Private Private Private Private Private Friend <link href="~/lib/datatables/css/dataTables.bootstrap4.min.css" rel
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: <script src="~/lib/datatables/js/jquery.dataTables.min.js"></script> <script src="~/lib/datatables/js/dataTables.bootstrap4.min.js"></script> <script src="~/js/ProductDatatable.js"></script>
	"~/lib/datatables/js/dataTables.bootstrap4.min.js"></script> <script src="~/js/ProductDatatable.js"></script>
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: Private <script src="~/lib/datatables/js/jquery.dataTables.min.js"></script> <script src="~/lib/datatables/js/dataTables.bootstrap4.min.js"></script> <script src
	"~/lib/datatables/js/jquery.dataTables.min.js"></script> <script src="~/lib/datatables/js/dataTables.bootstrap4.min.js"></script> <script src
	Private Private Private <script src="~/lib/datatables/js/jquery.dataTables.min.js"></script> <script src
End Class

[Route("api/[controller]")]
[ApiController]
public class ProductController : ControllerBase
{
    private readonly ApplicationDBContext context;
    public ProductController(ApplicationDBContext context)
    {
        this.context = context;
    }
    [HttpPost]
    public IActionResult GetProducts()
    {
        try
        {
            var draw = Request.Form ["draw"].FirstOrDefault();
            var start = Request.Form ["start"].FirstOrDefault();
            var length = Request.Form ["length"].FirstOrDefault();
            var searchValue = Request.Form ["search [value]"].FirstOrDefault();
            int pageSize = length != null ? Convert.ToInt32(length) : 0;
            int skip = start != null ? Convert.ToInt32(start) : 0;
            int recordsTotal = 0;
            var productData = context.Products.ToList();
            if (!string.IsNullOrEmpty(searchValue))
            {
                productData = productData.Where(m => m.ProductName.Contains(searchValue)

 m.ProductDescription.Contains(searchValue)

 m.Id.ToString().Contains(searchValue)).ToList();
            }
            recordsTotal = productData.Count();
            var data = productData.Skip(skip).Take(pageSize).ToList();
            var jsonData = new { draw = draw, recordsFiltered = recordsTotal, recordsTotal = recordsTotal, data = data };
            return Ok(jsonData);
        }
        catch (Exception ex)
        {
            throw;
        }
    }
}

<Route("api/[controller]")>
<ApiController>
Public Class ProductController
	Inherits ControllerBase

	Private ReadOnly context As ApplicationDBContext
	Public Sub New(ByVal context As ApplicationDBContext)
		Me.context = context
	End Sub
	<HttpPost>
	Public Function GetProducts() As IActionResult
		Try
			Dim draw = Request.Form ("draw").FirstOrDefault()
			Dim start = Request.Form ("start").FirstOrDefault()
			Dim length = Request.Form ("length").FirstOrDefault()
			Dim searchValue = Request.Form ("search [value]").FirstOrDefault()
			Dim pageSize As Integer = If(length IsNot Nothing, Convert.ToInt32(length), 0)
			Dim skip As Integer = If(start IsNot Nothing, Convert.ToInt32(start), 0)
			Dim recordsTotal As Integer = 0
			Dim productData = context.Products.ToList()
			If Not String.IsNullOrEmpty(searchValue) Then
				productData = productData.Where(Function(m) m.ProductName.Contains(searchValue) m.ProductDescription.Contains(searchValue) m.Id.ToString().Contains(searchValue)).ToList()
			End If
			recordsTotal = productData.Count()
			Dim data = productData.Skip(skip).Take(pageSize).ToList()
			Dim jsonData = New With {
				Key .draw = draw,
				Key .recordsFiltered = recordsTotal,
				Key .recordsTotal = recordsTotal,
				Key .data = data
			}
			Return Ok(jsonData)
		Catch ex As Exception
			Throw
		End Try
	End Function
End Class

public static void Main(string [] args)
 {
     var builder = WebApplication.CreateBuilder(args);
     builder.Services.AddDbContext<ApplicationDBContext>(options =>
     {
         options.UseSqlServer(builder.Configuration.GetConnectionString("ProductDB"));
     });
     builder.Services.AddControllers();
     // Add services to the container.
     builder.Services.AddRazorPages();
     var app = builder.Build();
     // Configure the HTTP request pipeline.
     if (!app.Environment.IsDevelopment())
     {
         app.UseExceptionHandler("/Error");
         // The default HSTS value is 30 days. You may want to change this for production scenarios, see .NET documentation https://aka.ms/aspnetcore-hsts.
         app.UseHsts();
     }
     app.UseHttpsRedirection();
     app.UseStaticFiles();
     app.UseRouting();
     app.UseAuthorization();
     app.MapControllers();
     app.MapRazorPages();
     app.Run();
 }

Public Shared Sub Main(ByVal args() As String)
	 Dim builder = WebApplication.CreateBuilder(args)
	 builder.Services.AddDbContext(Of ApplicationDBContext)(Sub(options)
		 options.UseSqlServer(builder.Configuration.GetConnectionString("ProductDB"))
	 End Sub)
	 builder.Services.AddControllers()
	 ' Add services to the container.
	 builder.Services.AddRazorPages()
	 Dim app = builder.Build()
	 ' Configure the HTTP request pipeline.
	 If Not app.Environment.IsDevelopment() Then
		 app.UseExceptionHandler("/Error")
		 ' The default HSTS value is 30 days. You may want to change this for production scenarios, see .NET documentation https://aka.ms/aspnetcore-hsts.
		 app.UseHsts()
	 End If
	 app.UseHttpsRedirection()
	 app.UseStaticFiles()
	 app.UseRouting()
	 app.UseAuthorization()
	 app.MapControllers()
	 app.MapRazorPages()
	 app.Run()
End Sub

public void ExportToExcel(List<Product> productList)
   {
       WorkBook wb = WorkBook.Create(ExcelFileFormat.XLSX);
       WorkSheet ws = wb.DefaultWorkSheet;
       int rowCount = 1;
       foreach (Product product in productList)
       {
           ws ["A" + (rowCount)].Value = product.Id.ToString();
           ws ["B" + (rowCount)].Value = product.ProductName;
           ws ["C" + (rowCount)].Value = product.ProductDescription;
           ws ["D" + (rowCount)].Value = product.ProductPrice;
           ws ["E" + (rowCount)].Value = product.ProductWeight;
           ws ["F" + (rowCount)].Value = product.ProductManufacturingDate;
           ws ["G" + (rowCount)].Value = product.ProductExpiryDate;
           rowCount++;
       }
       wb.SaveAs("product.xlsx");
   }

Public Sub ExportToExcel(ByVal productList As List(Of Product))
	   Dim wb As WorkBook = WorkBook.Create(ExcelFileFormat.XLSX)
	   Dim ws As WorkSheet = wb.DefaultWorkSheet
	   Dim rowCount As Integer = 1
	   For Each product As Product In productList
		   ws ("A" & (rowCount)).Value = product.Id.ToString()
		   ws ("B" & (rowCount)).Value = product.ProductName
		   ws ("C" & (rowCount)).Value = product.ProductDescription
		   ws ("D" & (rowCount)).Value = product.ProductPrice
		   ws ("E" & (rowCount)).Value = product.ProductWeight
		   ws ("F" & (rowCount)).Value = product.ProductManufacturingDate
		   ws ("G" & (rowCount)).Value = product.ProductExpiryDate
		   rowCount += 1
	   Next product
	   wb.SaveAs("product.xlsx")
End Sub