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  <xs:element id="dsgr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredTaxLiabilities" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredTaxLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLeaseObligation" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLeaseObligation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedExpensesAndOtherLiabilities" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedExpensesAndOtherLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredConsideration" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredConsideration" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_BusinessCombinationContingentConsiderationPayments" abstract="false" name="BusinessCombinationContingentConsiderationPayments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentContingentConsideration" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentContingentConsideration" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_BusinessCombinationDeferredConsiderationPayable" abstract="false" name="BusinessCombinationDeferredConsiderationPayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_OtherGeographicalMember" abstract="true" name="OtherGeographicalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_RentalProgramMember" abstract="true" name="RentalProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_IncreaseInEscrowDepositRelatedToBusinessAcquisition" abstract="false" name="IncreaseInEscrowDepositRelatedToBusinessAcquisition" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_PropertyPlantAndEquipmentExcludingRentalEquipmentMember" abstract="true" name="PropertyPlantAndEquipmentExcludingRentalEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_RentalEquipmentMember" abstract="true" name="RentalEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_DeferredAcquisitionPayment" abstract="false" name="DeferredAcquisitionPayment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_AccruedCustomerRebates" abstract="false" name="AccruedCustomerRebates" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_AccruedSeveranceCurrent" abstract="false" name="AccruedSeveranceCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_AccruedStockBasedCompensation" abstract="false" name="AccruedStockBasedCompensation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_SecurityBonusPlan" abstract="false" name="SecurityBonusPlan" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_OtherMiscellaneousLiabilities" abstract="false" name="OtherMiscellaneousLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_LawsonSegmentMember" abstract="true" name="LawsonSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_TestEquitySegmentMember" abstract="true" name="TestEquitySegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_GexproServicesSegmentMember" abstract="true" name="GexproServicesSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_CanadaBranchDivisionSegmentMember" abstract="true" name="CanadaBranchDivisionSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dsgr_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour" abstract="false" name="FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_FinanceLeaseCost" abstract="false" name="FinanceLeaseCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_NumberOfPropertiesSubleased" abstract="false" name="NumberOfPropertiesSubleased" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="dsgr_LeaseAssetsRightofUseAsset" abstract="false" name="LeaseAssetsRightofUseAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_FinanceLeaseLiabilityToBePaidAfterYearFour" abstract="false" name="FinanceLeaseLiabilityToBePaidAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_NetLeaseLiabilitiesPaymentsDueAbstract" abstract="true" name="NetLeaseLiabilitiesPaymentsDueAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="dsgr_NetLeaseLiabilityPaymentsRemainderofFiscalYear" abstract="false" name="NetLeaseLiabilityPaymentsRemainderofFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_NetLeaseLiabilityPaymentsDueYearOne" abstract="false" name="NetLeaseLiabilityPaymentsDueYearOne" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_NetLeaseLiabilityPaymentsDueYearTwo" abstract="false" name="NetLeaseLiabilityPaymentsDueYearTwo" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_NetLeaseLiabilityPaymentsDueYearThree" abstract="false" name="NetLeaseLiabilityPaymentsDueYearThree" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_NetLeaseLiabilityPaymentsDueYearFour" abstract="false" name="NetLeaseLiabilityPaymentsDueYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_NetLeaseLiabilityPaymentsDueAfterYearFour" abstract="false" name="NetLeaseLiabilityPaymentsDueAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_NetLeaseLiabilityPaymentsDue" abstract="false" name="NetLeaseLiabilityPaymentsDue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_NetLeaseLiabilityImputedInterest" abstract="false" name="NetLeaseLiabilityImputedInterest" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_NetLeaseLiabilityPresentValue" abstract="false" name="NetLeaseLiabilityPresentValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_LessorOperatingLeasePaymentToBeReceivedAfterYearFour" abstract="false" name="LessorOperatingLeasePaymentToBeReceivedAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_FrontierMember" abstract="true" name="FrontierMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_SeniorSecuredRevolvingCreditFacilityMember" abstract="true" name="SeniorSecuredRevolvingCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_SeniorSecuredTermLoanMember" abstract="true" name="SeniorSecuredTermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_OtherRevolvingCreditFacilitiesMember" abstract="true" name="OtherRevolvingCreditFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_DelayedDrawTermLoanFacilityMember" abstract="true" name="DelayedDrawTermLoanFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_VariableRateComponentAxis" abstract="true" name="VariableRateComponentAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="dsgr_VariableRateComponentDomain" abstract="true" name="VariableRateComponentDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_AlternateBaseRateOrCanadianPrimeRateMember" abstract="true" name="AlternateBaseRateOrCanadianPrimeRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_AdjustedTermSOFROrCORRARateMember" abstract="true" name="AdjustedTermSOFROrCORRARateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="dsgr_DebtInstrumentCovenantDefaultRate" abstract="false" name="DebtInstrumentCovenantDefaultRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="dsgr_RightsOfferingMember" abstract="true" name="RightsOfferingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dsgr_SaleOfStockTransactionCosts" abstract="false" name="SaleOfStockTransactionCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dsgr_RelatedPartyManagedServicesAgreementsMember" abstract="true" name="RelatedPartyManagedServicesAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dsgr_DistributionSolutionsGroupMember" abstract="true" name="DistributionSolutionsGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dsgr_LKCMHeadwaterOperationsLLCMember" abstract="true" name="LKCMHeadwaterOperationsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dsgr_RelatedPartyTransactionSharesOwned" abstract="false" name="RelatedPartyTransactionSharesOwned" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="dsgr_CorporateAndReconcilingItemsMember" abstract="true" name="CorporateAndReconcilingItemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
</xs:schema>
