c# - 数据表到字符串

Question

我有一个包含三列的数据表

Id name value value1

我想从此数据表创建一个字符串，以便

1. 数据表中的每一行将创建两行
2. 名称将变为一行
3. 值 1 将成为另一行

4. 如果 name 和 value1 相似，则仅包含 value 1，否则同时包含 name 和 value1（完成）

5. 如果一行的名称与任何其他行中的名称相似，则在字符串中的两个重复行前面添加以下文本

Id 与 Id 相似

这是我到目前为止所写的：

Public Function GetGazetteer(dataTable As DataTable) As String
            Dim processedData = New List(Of String)
            Dim rowData = String.Empty
            Dim results = New StringBuilder()

            For Each row As DataRow In dataTable.Rows
                processedData.Add(row(1))
                If row(3) <> row(1) Then
                    processedData.Add(row(3))
                End If
            Next

            For Each row As String In processedData
                rowData = row

                If rowData.Trim <> String.Empty Then
                    If (processedData.Where(Function(d) d = rowData).Count = 1) Then
                        results.Append(rowData)
                        results.Append("<br />")
                    Else
                        results.Append(rowData)
                        results.Append("*")
                        results.Append("<br />")
                    End If
                End If

            Next

            Return results.ToString
        End Function

目前，*已添加（请建议如何添加上述文本。）

这是一个示例

id   name           value  value1
1    this is string 1       abc    This is sample
2    this is string 2       abc    this is string 2
3    this is string 3       abc    this is string 4
4    this is string 3       abc    asasaasd

这是所需的输出

this is string 1
This is sample
this is string 2
*3 is duplicate of 4* this is string 3
this is string 4
*4 is duplicate of 3* this is string 3
asasaasd

Answer 1

根据问题给出的输出进行编辑

这是使用 C# 的解决方案（希望您可以将其转换为 VB.NET）。我使用了一个结构来保存 id、value、col 信息。

结构是

    public struct Container
    {
       public int Id;
       public int Col;
       public string Value;
    }

方法是

        public string GetGazetteer(DataTable dtInput)
        {
            string result = null;
            List<Container> containers = new List<Container>();
            List<Container> finalContainers = new List<Container>();
            StringBuilder sb = new StringBuilder();

            foreach (DataRow row in dtInput.Rows)
            {
                Container container;
                container = new Container() { Id = int.Parse(row[0].ToString()), Value = row[1].ToString(), Col = 1 };
                containers.Add(container);
                if (row[1] != row[3])
                {
                    container = new Container() { Id = int.Parse(row[0].ToString()), Value = row[3].ToString(), Col = 2 };
                    containers.Add(container);
                }
            }

            containers = containers.OrderBy(c => c.Value).ThenBy(c => c.Id).ToList();

            if (containers.Count > 0)
            {
                string initialVal = containers[0].Value;
                finalContainers.Add(containers[0]);
                for (int i = 1; i < containers.Count; i++)
                {
                    if (containers[i].Value == initialVal)
                    {
                        finalContainers.Remove(containers[i]);
                        finalContainers.Remove(containers[i - 1]);
                        finalContainers.Add(new Container() { Id = containers[i - 1].Id, Value = "*" + containers[i - 1].Id + " is duplicate of " + containers[i].Id + "* " + containers[i - 1].Value });
                        finalContainers.Add(new Container() { Id = containers[i].Id, Value = "*" + containers[i].Id + " is duplicate of " + containers[i - 1].Id + "* " + containers[i].Value });
                    }
                    else
                    {
                        finalContainers.Add(containers[i]);
                    }

                    initialVal = containers[i].Value;
                }

                finalContainers = finalContainers.OrderBy(c => c.Id).ThenBy(c => c.Col).ToList();

                foreach (Container container in finalContainers)
                {
                    sb.Append(container.Value + "</br>");
                }

                result = sb.ToString();
            }

            return result;
        } 

这是我用于测试的示例数据表

            DataTable dtInput = new DataTable();
            dtInput.Columns.Add("id");
            dtInput.Columns.Add("name");
            dtInput.Columns.Add("value");
            dtInput.Columns.Add("value1");

            DataRow drInput1 = dtInput.NewRow();
            drInput1[0] = "1";
            drInput1[1] = "this is string 1";
            drInput1[2] = "abc";
            drInput1[3] = "This is sample";
            dtInput.Rows.Add(drInput1);

            DataRow drInput2 = dtInput.NewRow();
            drInput2[0] = "2";
            drInput2[1] = "this is string 2";
            drInput2[2] = "abc";
            drInput2[3] = "this is string 2";
            dtInput.Rows.Add(drInput2);

            DataRow drInput3 = dtInput.NewRow();
            drInput3[0] = "3";
            drInput3[1] = "this is string 3";
            drInput3[2] = "abc";
            drInput3[3] = "this is string 4";
            dtInput.Rows.Add(drInput3);

            DataRow drInput4 = dtInput.NewRow();
            drInput4[0] = "4";
            drInput4[1] = "this is string 3";
            drInput4[2] = "abc";
            drInput4[3] = "asasaasd";
            dtInput.Rows.Add(drInput4);

输出将是

this is string 1</br>This is sample</br>this is string 2</br>*3 is duplicate of 4* this is string 3</br>this is string 4</br>*4 is duplicate of 3* this is string 3</br>asasaasd</br>