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Getting Started

Installation

package manager console

.NET CLI Console

Requirements

There are some basic .NET knowledge that implies when using this documentation. Please look at the prequisitics to make sure you have an understanding of them. Requirements

Cultivinfo

csvhelper requires you to specify the culture info you want to use. The culture is used to determine the standard delimiter to determine the standard line and formatting when converting the type. You can also change the configuration of one of it if you want. Choose the appropriate culture for your data. InvariantCulture is the most popular to write a file and read again so that it is used in most examples.

Newlinees

By default, CSVHelper RFC 4180 is followed by using the newbie, no matter which operating system you are running. Csvhelper can read \ r \ n, \ r or \ n without configuration changes. If you want to read or write in a non-standard format, you can change the configuration for Newline.

Read a CSV file

Let's say we have a CSV file that looks like this.

And a class definition that looks like this.

If our class properties names match the names of the CSV file header names, we can read the file without configuration.

The GEARCORDS method returns an IENUMERABLE, which results in records. This means that only a single record is returned simultaneously when it is available to the records. This also means that only a small part of the file is read in the memory. Be careful. If you do everything a LINQ projection, z. B. call. Tolist (), the entire file is read in the memory. CSVReader is only forward. So if you want to run all link queries from your data, you must pull the entire file into the store. I just know that's what you do.

say we say that our CSV filenames are different than our class properties and we do not want our properties to match.

In this case, the names are lowercase. We want our property names Pascal Case, so we can easily change how our properties match the header names.

Using the Configuration PrepliaHeatherFormatTath, we can change how the header matching is against the property name. Both the header and the property name are executed by the function prepleerformatch function. If the reader has to find the property to set for the header, they agree now. You can use this feature to do other things, e.g. B. Remove Whitespace or other characters.

say we say that the CSV file has no head line at all.

First, we must inform the reader that there is no header record using the configuration.

csvReader uses the position of the properties in the class as an index position. With this there is a problem. You can not rely on the order of class members in .NET. We can solve this by taking the property on a position in the CSV file.

One way to do this is with attribute mapping.

With the index attributes, you can specify which position the CSV field should specify that you want to use for the property.

You can also assign names. If we use our lowercase example from the front and see how we can use attributes instead of changing the header matching.

What if we do not have control of the class we want to assign so that we can not add it to attributes? In this case we can use a flowing class map to perform the mapping.

To use the mapping, we have to register it in the context.

Creating a class card is the recommended way to associate files in Csvhelper, as it is much stronger.

You can also read rows of hand.

Reading will drive the line. Readheder read the line in Csvhelper as header values.Disconnecting read head and readheader allows you to take other things with the header line before moving to the next line. Drecord does not make the reader so you can take other things with the line that you may need to do. You may need to call one or more several times several times for a single field to fill more than one object.

Writing a CSV file

Now let's look at how we can write CSV files. It is basically the same, but in reverse order.

Let us use the same class definition as before.

And we have a number of records.

We can write the records without configuration in a file.

The WriteRecords method writes all records to the file. After you have done the writing, you should call the writer.Flush () To ensure that all data has been rinsed to the file in the internal buffer of the Writer. As soon as a block has used, the author is automatically rinsed so that we do not explicitly do it. It is recommended to always wrap an idi-fifty object with the blocks used. The object is disposed of by itself (and in our case in our case) as soon as possible after the block used has left.

Do you remember how we can not rely on the deposit in .NET? If we write a class that has a header, it does not matter as long as we read later with the headers. If we want to position the header in the CSV file, we must specify an index to ensure the order. It is recommended to always set an index when writing.

You can also write rows by hand.

Writeheader will not pass it on to the next row. With the separation of Nextrecord by Whileholder, you can write more things into the header if you want. Writerecord will not introduce you to the next line to give you the opportunity to write multiple objects or to use Writefield to write individual fields.

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