C#•15mo ago

❔ string[]' does not contain a definition for 'FirstOrDefault' and no accessible extension method...

This is probably a simple mistake so I apologize in advance.

c#
using System;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;

internal class VersionAgnosticSerializationBinder : SerializationBinder
{
    public override Type BindToType(string assemblyName, string typeName)
    {
        Type type = Type.GetType(Assembly.CreateQualifiedName(assemblyName, typeName));
        if (type == null)
        {
            string simpleAssemblyName = assemblyName.Split(new char[1] { ',' }).FirstOrDefault();
            if (string.IsNullOrEmpty(simpleAssemblyName))
            {
                throw new InvalidOperationException("Cannot retrieve assembly name from string '" + assemblyName + "'");
            }
            Assembly assembly2 = AppDomain.CurrentDomain.GetAssemblies().FirstOrDefault((Assembly assembly) => assembly.GetName().Name.Equals(simpleAssemblyName));
            if (assembly2 == null)
            {
                throw new InvalidOperationException("The requested assembly '" + simpleAssemblyName + "' was not found");
            }
            type = assembly2.GetType(typeName);
        }
        if (type == null)
        {
            Logger.TraceEvent(TraceEventType.Critical, null, "Cannot bind requested type  \"{0}, {1}\"", assemblyName, typeName);
        }
        return type;
    }
}

c#
using System;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;

internal class VersionAgnosticSerializationBinder : SerializationBinder
{
    public override Type BindToType(string assemblyName, string typeName)
    {
        Type type = Type.GetType(Assembly.CreateQualifiedName(assemblyName, typeName));
        if (type == null)
        {
            string simpleAssemblyName = assemblyName.Split(new char[1] { ',' }).FirstOrDefault();
            if (string.IsNullOrEmpty(simpleAssemblyName))
            {
                throw new InvalidOperationException("Cannot retrieve assembly name from string '" + assemblyName + "'");
            }
            Assembly assembly2 = AppDomain.CurrentDomain.GetAssemblies().FirstOrDefault((Assembly assembly) => assembly.GetName().Name.Equals(simpleAssemblyName));
            if (assembly2 == null)
            {
                throw new InvalidOperationException("The requested assembly '" + simpleAssemblyName + "' was not found");
            }
            type = assembly2.GetType(typeName);
        }
        if (type == null)
        {
            Logger.TraceEvent(TraceEventType.Critical, null, "Cannot bind requested type  \"{0}, {1}\"", assemblyName, typeName);
        }
        return type;
    }
}

error CS1061: 'string[]' does not contain a definition for 'FirstOrDefault' and no accessible extension method 'FirstOrDefault' accepting a first argument of type 'string[]' could be found

3 Replies

Omnissiah•15mo ago

(for one char i don't think you need the char array in the split)

MrBruhOP•15mo ago

This needs System.Linq but I accidently specified a very old build version which didn't include the needed libraries/functions. Upgrading from net4.0 to net7.0 solved the problem

Accord•15mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ string[]' does not contain a definition for 'FirstOrDefault' and no accessible extension method...