The first element is missing when using stream as input in WCF rest service C#

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I have a wcf rest service with Stream as input parameter:

C#

[OperationContract]
   [WebInvoke(Method = "POST", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.WrappedRequest)]
   void ImportStream(Stream data);

And this is my text as input in POSTMAN:

HTML

D_CA,P_AMOUNT,D_AN,D_PE,D_RU,D_NU,D_CO,D_MU,D_PMU,D_DP,P_COMMENT                              
A,100,,2019.12,S000,S000,S002,EUR,ORIG07-01,0000.PACKAGE,,,,,,2019.12,           
A,100,,2019.12,S000,,S004,EUR,ORIG07-01,0000.PACKAGE,,,,,,2019.12,

As result, I have textRead:

HTML

"_CA,P_AMOUNT,D_AN,D_PE,D_RU,D_ORU,D_AC,,D_GO,D_LE,D_NU,D_CO,D_MU,D_PMU,D_DP,P_COMMENT     ....... "

As you see the first Character 'D' is missing !?

How can I fix it ? Thanks

What I have tried:

C#

public void ImportStream(Stream data)
    {
        if (data.ReadByte() != -1)
        {                
            using (var reader = new StreamReader(data))
            {                               
                string textRead = reader.ReadToEnd();
            }
        }
}

Posted 10-Jan-20 2:40am

Member 14601214

Updated 10-Jan-20 2:58am

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Kris Lantz · Accepted Answer · 2020-01-10T02:59:00

Solution 1

According to the documentation here: Stream.ReadByte Method (System.IO) | Microsoft Docs[^], the ReadByte() Method is going to read the first byte of the stream, and advance by one, meaning

C#

using (var reader = new StreamReader(data))

will be processed from data[1], instead of data[0].

Posted 10-Jan-20 2:59am

Kris Lantz

Updated 10-Jan-20 3:00am

v2

Comments

Member 14601214 10-Jan-20 9:12am

Thanks for your reply, it is clear ,
I understand now ,
This is my code :

using (var reader = new StreamReader(data))
{

string allStreamString= reader.ReadToEnd();

}