Reportviewer :Method not found: 'System.String System.String.Format(System.IFormatProvider, System.String, System.Object)'.

Kedar Bhapkar 1 Reputation point

i'm getting below Error while loading Report

Method not found: 'System.String System.String.Format(System.IFormatProvider, System.String, System.Object)'.


A set of technologies in the .NET Framework for building web applications and XML web services.
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  1. Lan Huang-MSFT 28,836 Reputation points Microsoft Vendor

    Hi @Kedar Bhapkar ,
    According to its MSDN page,
    the overload you're using is only supported on .NET 4.6.
    Either configure the host to run .NET 4.6 or change the target framework of the project to 4.5 and recompile.
    In 4.5 there's a params object[] overload which will then be chosen, without having to alter your code.
    If you can neither upgrade host to 4.6 nor downgrade project to 4.5 there is a workaround : pass an "object[]" as args instead of an "object".
    So you will force usage of the "params object[]" overload. Example :
    return string.Format(formatProvider, "{0:" + format + "}", new object[] { value });
    Best regards,
    Lan Huang

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