Question

我有CSV文件，其中包含大约25列和100行。

我正在尝试验证行的每一列，如果失败，我想创建一个包含行号，列名失败等的表，并在所有行处理后显示它。

这方面的任何线索都可以吗？我怎样才能做到这一点？以下是代码：

  protected void ValidateData_Click(object sender , EventArgs e )
        {
            //Upload and save the file
            string filePath = Server.MapPath("~/Files/") + Path.GetFileName(UploadFile.PostedFile.FileName);
            UploadFile.SaveAs(filePath);

            //read and validate csv file
            ValidateCsv(filePath);

        }
        //Validate CSV file
        private void ValidateCsv(string fileContent)
        {
            DataTable getCSVData;
            getCSVData=GetData(fileContent);
            ValidateRows(getCSVData);    

        }

        //get data from csv
        private DataTable GetData(string fileContent)
        {
            //read csv file
            DataTable dataTable = new DataTable();
            using (StreamReader reader = new StreamReader(fileContent))
            {
                string[] headers = reader.ReadLine().Split(',');
                foreach (string header in headers)
                {
                    dataTable.Columns.Add(header);
                }
                while (!reader.EndOfStream)
                {
                    string[] csvRow = reader.ReadLine().Split(',');
                    DataRow dataRow = dataTable.NewRow();
                    for (int i = 0; i < headers.Length; i++)
                    {
                        dataRow[i] = csvRow[i];
                    }
                    dataTable.Rows.Add(dataRow);
                }

            }
            return dataTable;
        }
        //validate Rows
        private void ValidateRows(DataTable csvDataTable)
        {

        }

由于

Answer 1

这是一个可用于验证方法的超级基本结构。

private void ValidateRows(DataTable csvDataTable)
{
    DataTable invalidatedTable = new DataTable();

    // If you only want certain columns in the datatable do this for each.
    DataTable invalidatedTable = new DataTable();
    invalidatedTable.Columns.Add("ColumnName", typeof(string));

    // If you want all the columns in the new datatable that are in the source then do this.
    DataTable invalidatedTable = csvDataTable.Clone();

    // Loop over all the rows in the datatable
    foreach (DataRow row in csvDataTable.Rows)
    {
        bool invalidated = false;

        // Check if id column is null
        if (row["id"] == null)
            invalidated = true;

        // Check some other column is not equal to some value
        if (row["columnName"].ToString() != "Whatever you consider valid")
        {
            invalidated = true;
        }

        // If you'd like to loop through the columns instead...
        foreach (DataColumn column in csvDataTable.Columns)
        {
            if (row[column] != SomeTest)
            {
                invalidated = true;
            }
        }

        // if any of the rules above marked this row as invalid then add to table
        if (invalidated)
        {           
            // this will add a copy of the entire row from the original table
            invalidatedTable.Rows.Add(row.ItemArray);

            // if instead you'd like to edit the data first then do this
            // Note: Depending on your data structure you may need to add nulls or values
            // to columns to keep your tables with the same structure.
            DataRow invalidRow = invalidatedTable.NewRow()
            invalidRow["columnName"] = "someValue"
            invalidatedTable.Rows.Add(invalidRow);
        }

    } // End Loop

    // Show the invalid rows on a form control
    SomeFunctionThatBindsDatatableToFormControl(invalidatedTable);
}

根据您的具体需求，有许多方法可以修改，改进等，但希望这可以让您至少开始。

如何使用c＃验证csv文件列并在表中显示失败的行

1 个答案: