Question

我想知道如何读取由控件上传的csv文件。我曾尝试使用OLEDB，但我得到一个例外。关于该文件是只读的东西。任何帮助表示赞赏。感谢

Answer 1

您可以尝试FileHelpers library 以下是使用FileUpload控件的示例：

[DelimitedRecord(",")]  // comma separated values
[IgnoreFirst(1)]        // first line is assumed to be the header
[IgnoreEmptyLines]      // ignore empty lines
class MyClass {

    [FieldTrim(TrimMode.Both)]
    [FieldQuoted('"', QuoteMode.OptionalForBoth)]
    public string FirstName;

    [FieldTrim(TrimMode.Both)]
    [FieldQuoted('"', QuoteMode.OptionalForBoth)]
    public string LastName;
}

protected void Button1_Click(object sender, EventArgs e) {
    if (!FileUpload1.HasFile) {
        // No CSV file selected
        return
    }
    using (StreamReader sr = new StreamReader(FileUpload1.PostedFile.InputStream)) {
        FileHelperEngine engine = new FileHelperEngine(typeof(MyClass));
        foreach (MyClass entry in engine.ReadStream(sr)) {
            // do something
        }
    }
}

Answer 2

我不知道您正在获得的具体错误或您尝试过的内容，我使用类似以下的内容来读取OLED文件中的CSV文件

string sCSVConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + PATHTOFILE + @";Extended Properties='text;HDR=Yes;FMT=Delimited(,)';";

using ( OleDbConnection connection = new OleDbConnection(sCSVConnectionString))
{
    connection.ConnectionString = sCSVConnectionString;
    connection.Open();

    using (DbCommand command = connection.CreateCommand())
    {
        command.CommandText = "SELECT * FROM [" + FILENAME + "]";

        using (DbDataReader dr = command.ExecuteReader())
        {
            while (dr.Read())
            {
                // do something with the DataReader dr here.
            }

            dr.Close();
        }
    }

    connection.Close();
}

Answer 3

我曾经使用Fast CSV reader几次，确实很快。这是我在面对CSV文件时使用的。

祝你好运GJ

使用asp.net c＃读取上传的.csv文件

3 个答案: