報告服務向C＃中的DataTable報告

Question

我可以通過以下方式用逗號分隔字符串：

byte[] bytes = rvMain.ServerReport.Render("csv", null, out mimeType, out encoding, out filenameExtension, out streamids, out warnings);

string CsvBody = System.Text.Encoding.Default.GetString(bytes);

但是，我需要數據表中的數據。

請有人幫我做這個嗎？

我無法在CSV上進行拆分，因為它上面有可選的引號，而且我不知道如何將其關閉。

我可以從查詢中創建一個數據表，但是報表上有兩個日期參數，因此，如果我可以訪問這些數據的值，我也可以。

我撞到了磚牆。

Answer 1

我在下面寫了五種方法。

它們的設計考慮到了可選的引號（例如“符號”），並且在不使用其他庫的情況下具有盡可能多的用途：

    public static DataTable GetDataTabletFromCSVFile(string filePath, bool isHeadings)
    {
        DataTable MethodResult = null;
        try
        {
            using (TextFieldParser TextFieldParser = new TextFieldParser(filePath))
            {
                if (isHeadings)
                {
                    MethodResult = GetDataTableFromTextFieldParser(TextFieldParser);

                }
                else
                {
                    MethodResult = GetDataTableFromTextFieldParserNoHeadings(TextFieldParser);

                }

            }

        }
        catch (Exception ex)
        {
            ex.HandleException();
        }
        return MethodResult;
    }

    public static DataTable GetDataTableFromCsvString(string csvBody, bool isHeadings)
    {
        DataTable MethodResult = null;
        try
        {
            MemoryStream MemoryStream = new MemoryStream();


            StreamWriter StreamWriter = new StreamWriter(MemoryStream);

            StreamWriter.Write(csvBody);

            StreamWriter.Flush();


            MemoryStream.Position = 0;


            using (TextFieldParser TextFieldParser = new TextFieldParser(MemoryStream))
            {
                if (isHeadings)
                {
                    MethodResult = GetDataTableFromTextFieldParser(TextFieldParser);

                }
                else
                {
                    MethodResult = GetDataTableFromTextFieldParserNoHeadings(TextFieldParser);

                }

            }

        }
        catch (Exception ex)
        {
            ex.HandleException();
        }
        return MethodResult;
    }

    public static DataTable GetDataTableFromRemoteCsv(string url, bool isHeadings)
    {
        DataTable MethodResult = null;
        try
        {
            HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();

            StreamReader StreamReader = new StreamReader(httpWebResponse.GetResponseStream());

            using (TextFieldParser TextFieldParser = new TextFieldParser(StreamReader))
            {
                if (isHeadings)
                {
                    MethodResult = GetDataTableFromTextFieldParser(TextFieldParser);

                }
                else
                {
                    MethodResult = GetDataTableFromTextFieldParserNoHeadings(TextFieldParser);

                }

            }

        }
        catch (Exception ex)
        {
            ex.HandleException();
        }
        return MethodResult;
    }


    private static DataTable GetDataTableFromTextFieldParser(TextFieldParser textFieldParser)
    {
        DataTable MethodResult = null;
        try
        {
            textFieldParser.SetDelimiters(new string[] { "," });

            textFieldParser.HasFieldsEnclosedInQuotes = true;


            string[] ColumnFields = textFieldParser.ReadFields();

            DataTable dt = new DataTable();

            foreach (string ColumnField in ColumnFields)
            {
                DataColumn DataColumn = new DataColumn(ColumnField);

                DataColumn.AllowDBNull = true;

                dt.Columns.Add(DataColumn);

            }


            while (!textFieldParser.EndOfData)
            {
                string[] Fields = textFieldParser.ReadFields();


                for (int i = 0; i < Fields.Length; i++)
                {
                    if (Fields[i] == "")
                    {
                        Fields[i] = null;

                    }

                }

                dt.Rows.Add(Fields);

            }

            MethodResult = dt;

        }
        catch (Exception ex)
        {
            ex.HandleException();
        }
        return MethodResult;
    }

    private static DataTable GetDataTableFromTextFieldParserNoHeadings(TextFieldParser textFieldParser)
    {
        DataTable MethodResult = null;
        try
        {
            textFieldParser.SetDelimiters(new string[] { "," });

            textFieldParser.HasFieldsEnclosedInQuotes = true;

            bool FirstPass = true;

            DataTable dt = new DataTable();

            while (!textFieldParser.EndOfData)
            {
                string[] Fields = textFieldParser.ReadFields();

                if(FirstPass)
                {
                    for (int i = 0; i < Fields.Length; i++)
                    {
                        DataColumn DataColumn = new DataColumn("Column " + i);

                        DataColumn.AllowDBNull = true;

                        dt.Columns.Add(DataColumn);

                    }

                    FirstPass = false;

                }

                for (int i = 0; i < Fields.Length; i++)
                {
                    if (Fields[i] == "")
                    {
                        Fields[i] = null;

                    }

                }

                dt.Rows.Add(Fields);

            }

            MethodResult = dt;

        }
        catch (Exception ex)
        {
            ex.HandleException();
        }
        return MethodResult;
    }

如果像我一樣，您正在從報表服務中保存，則應該這樣使用它：

    Warning[] warnings;
    string[] streamids;
    string mimeType;
    string encoding;
    string filenameExtension;

    byte[] bytes = rvMain.ServerReport.Render("csv", null, out mimeType, out encoding, out filenameExtension, out streamids, out warnings);

    string CsvBody = System.Text.Encoding.UTF8.GetString(bytes);

    DataTable dt = GetDataTableFromCsvString(CsvBody,true);

否則，您需要做的是：

    bool IsHeadings = true; //Does the data include a heading row?

    DataTable dt = GetDataTableFromCsvString(CsvBody, IsHeadings);

或者直接從csv文件使用

    bool IsHeadings = true; //Does the data include a heading row?

    DataTable dt = GetDataTabletFromCsvFile(FilePath, IsHeadings)

或使用遠程存儲的csv文件

    bool IsHeadings = true; //Does the data include a heading row?

    DataTable dt = GetDataTabletFromRemoteCsv(Url, IsHeadings)